Παραπομπή APA

Dahlberg I. (1978). Ontical structures and universal classification. Sarada Ranganathan Endowment.

Παραπομπή Chicago Style

Dahlberg I. Ontical Structures and Universal Classification. London: Sarada Ranganathan Endowment, 1978.

Παραπομπή MLA

Dahlberg I. Ontical Structures and Universal Classification. Sarada Ranganathan Endowment, 1978.