APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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