Ulrich's International periodicals directory a classified guide to current periodicals, foreign and domestic.

MLA

Ulrich's International Periodicals Directory: a Classified Guide to Current Periodicals, Foreign and Domestic. New York: Bowker, .d.

APA

(.d). Ulrich's International periodicals directory: a classified guide to current periodicals, foreign and domestic. New York: Bowker.

Chicago

Ulrich's International Periodicals Directory: A Classified Guide to Current Periodicals, Foreign and Domestic. New York: Bowker, .d.