diff --git a/src/Pubiblio/ZoteroAPI.class.st b/src/Pubiblio/ZoteroAPI.class.st
new file mode 100644
index 0000000..d3f11f0
--- /dev/null
+++ b/src/Pubiblio/ZoteroAPI.class.st
@@ -0,0 +1,17 @@
+"
+I model the information of the Zotero API. I collaborate with other objects to define repetitive API urls.
+"
+Class {
+	#name : #ZoteroAPI,
+	#superclass : #Object,
+	#category : #Pubiblio
+}
+
+{ #category : #'as yet unclassified' }
+ZoteroAPI class >> baseURL [
+	"I provide the base URL where the API services are provided. 
+	For more information visit:
+	
+	"
+	^ 'https://api.zotero.org/'
+]
diff --git a/src/Pubiblio/ZoteroLibrary.class.st b/src/Pubiblio/ZoteroLibrary.class.st
new file mode 100644
index 0000000..586777d
--- /dev/null
+++ b/src/Pubiblio/ZoteroLibrary.class.st
@@ -0,0 +1,113 @@
+"
+I allow to query zotero libraries, given the groupID or the userID that the libraries belong to.
+
+"
+Class {
+	#name : #ZoteroLibrary,
+	#superclass : #Object,
+	#instVars : [
+		'groupID',
+		'userID'
+	],
+	#category : #Pubiblio
+}
+
+{ #category : #utility }
+ZoteroLibrary >> collectionsURL [
+	"I provide the common part of the collections URL for the Zotero API"
+
+	^ self groupURL, '/collections/'
+]
+
+{ #category : #utility }
+ZoteroLibrary >> emptyValuesWarning [
+
+	self inform: 'WARNING! groupID or userID should be non-emtpy. Please fill them to get available collections'.
+	^ self
+]
+
+{ #category : #querying }
+ZoteroLibrary >> generalInfo [
+	"I return the last 25 the public collections for a particular group or user"
+	^ NeoJSONReader fromString: (ZnEasy get: self groupURL) contents.
+]
+
+{ #category : #accessing }
+ZoteroLibrary >> groupID [
+	^ groupID
+]
+
+{ #category : #accessing }
+ZoteroLibrary >> groupID: aString [
+	groupID := aString
+]
+
+{ #category : #utility }
+ZoteroLibrary >> groupURL [
+	"I provide the common part of the group URL for the Zotero API"
+
+	groupID ifNotNil: [ ^ ZoteroAPI baseURL,'groups/',groupID,'/' ].
+	userID 
+		ifNotNil: [ ^ ZoteroAPI baseURL,'groups/',userID,'/' ] 
+		ifNil: [ self emptyValuesWarning ] 
+]
+
+{ #category : #querying }
+ZoteroLibrary >> lastCollections [
+	"I return all the public collections for a particular group or user"
+	^ NeoJSONReader fromString: (ZnEasy get: self collectionsURL) contents
+	
+
+]
+
+{ #category : #querying }
+ZoteroLibrary >> lastItems [
+	"I return the last 25 items of the public collections for a particular group or user"
+	^ NeoJSONReader fromString: (ZnEasy get: self groupURL,'items') contents
+]
+
+{ #category : #querying }
+ZoteroLibrary >> subcollection: keyString [
+	"I give the general info for a subcollection, given is alphanumeric key"
+	
+	^ NeoJSONReader fromString: (ZnEasy get: (self subcollectionURL:keyString)) contents.
+
+]
+
+{ #category : #querying }
+ZoteroLibrary >> subcollectionAsBibTeX: keyString [
+	"I give all the items for a subcollection, given is alphanumeric key, excluding notes and attachments, exported as bibtex"
+	
+	^ (ZnEasy get: (self subcollectionURL: keyString,'/items?itemType=-note || attachment &format=bibtex')) contents utf8Decoded.
+]
+
+{ #category : #querying }
+ZoteroLibrary >> subcollectionLastItems: keyString [
+	"I give the last 25 items for a subcollection, given is alphanumeric key, including notes, attachments"
+
+	^ NeoJSONReader fromString: (ZnEasy get: (self subcollectionURL:  keyString,'/items')) contents.
+]
+
+{ #category : #querying }
+ZoteroLibrary >> subcollectionLastParentItems: keyString [
+	"I give all the items for a subcollection, given is alphanumeric key, excluding notes and attachments"
+	
+	^ NeoJSONReader fromString: (ZnEasy get: (self subcollectionURL:keyString,'/items?itemType=-note || attachment')) contents.
+]
+
+{ #category : #utility }
+ZoteroLibrary >> subcollectionURL: keyString [
+	"I provide the common part of the subcollection URL for the Zotero API, given its key string"
+	
+	^ self collectionsURL,keyString
+]
+
+{ #category : #accessing }
+ZoteroLibrary >> userID [
+	^ userID
+]
+
+{ #category : #accessing }
+ZoteroLibrary >> userID: aString [
+	userID := aString
+]
diff --git a/src/Pubiblio/package.st b/src/Pubiblio/package.st
new file mode 100644
index 0000000..ae38061
--- /dev/null
+++ b/src/Pubiblio/package.st
@@ -0,0 +1 @@
+Package { #name : #Pubiblio }