1988. Ulrich's update: <a> quarterly supplement to Ulrich's international periodicals directory. Vol. 1., no. 2, December 1988. New York: Bowker.
Citace podle APA (7th ed.)(1988). Ulrich's update: <a> quarterly supplement to Ulrich's international periodicals directory. Vol. 1., no. 2, December 1988. Bowker.
Citace podle Chicago (17th ed.)Ulrich's Update: <a> Quarterly Supplement to Ulrich's International Periodicals Directory. Vol. 1., No. 2, December 1988. New York: Bowker, 1988.
Citace podle MLA (9th ed.)Ulrich's Update: <a> Quarterly Supplement to Ulrich's International Periodicals Directory. Vol. 1., No. 2, December 1988. Bowker, 1988.
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