Παραπομπή APA

Van Rijsbergen, C. J. (1979). Information retrieval (2nd. ed.). Butterworths.

Παραπομπή Chicago Style

Van Rijsbergen, C. J. Information Retrieval. 2nd. ed. London: Butterworths, 1979.

Παραπομπή MLA

Van Rijsbergen, C. J. Information Retrieval. 2nd. ed. Butterworths, 1979.