Παραπομπή σε μορφή APA (7η εκδ.)

Hjorland, B. (1997). Information seeking and subject representation: An activity-theoretical approach to information science. Greenwood Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hjorland, Birger. Information Seeking and Subject Representation: An Activity-theoretical Approach to Information Science. Westport, Connecticut: Greenwood Press, 1997.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hjorland, Birger. Information Seeking and Subject Representation: An Activity-theoretical Approach to Information Science. Greenwood Press, 1997.