Παραπομπή APA

(2001). Ulrich's periodicals directory V.4 (39ed.). R.R. Bowker.

Παραπομπή Chicago Style

Ulrich's Periodicals Directory V.4. 39ed. London: R.R. Bowker, 2001.

Παραπομπή MLA

Ulrich's Periodicals Directory V.4. 39ed. R.R. Bowker, 2001.