Dyfyniad APA

Graves, E. C. (1965). Ulrich's international periodicals directory: A classified guide to current periodicals, foreign and domestic (Eleventh edition.). R.R. Bowker Company.

Dyfyniad Arddull Chicago

Graves, Eileen C. Ulrich's International Periodicals Directory: A Classified Guide to Current Periodicals, Foreign and Domestic. Eleventh edition. New York: R.R. Bowker Company, 1965.

Dyfyniad MLA

Graves, Eileen C. Ulrich's International Periodicals Directory: A Classified Guide to Current Periodicals, Foreign and Domestic. Eleventh edition. R.R. Bowker Company, 1965.

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