1991. Ulrich's international periodicals directory 1991-92. Vol. 1. Subjects A-G: Including irregular serials and annuals. 30th ed. New Providence: Bowker.
Citace podle APA (7th ed.)(1991). Ulrich's international periodicals directory 1991-92. Vol. 1. Subjects A-G: Including irregular serials and annuals (30th ed.). Bowker.
Citace podle Chicago (17th ed.)Ulrich's International Periodicals Directory 1991-92. Vol. 1. Subjects A-G: Including Irregular Serials and Annuals. 30th ed. New Providence: Bowker, 1991.
Citace podle MLA (9th ed.)Ulrich's International Periodicals Directory 1991-92. Vol. 1. Subjects A-G: Including Irregular Serials and Annuals. 30th ed. Bowker, 1991.
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