Παραπομπή APA

Porter, K. I., & Koster, C. J. (1973). British union-catalogue of periodicals: Incorporating world list of scientific periodicals : new periodical titles 1973. London: Butterworths.

Παραπομπή Chicago Style

Porter, Kenneth I., and C. J. Koster. British Union-catalogue of Periodicals: Incorporating World List of Scientific Periodicals : New Periodical Titles 1973. London: Butterworths, 1973.

Παραπομπή MLA

Porter, Kenneth I., and C. J. Koster. British Union-catalogue of Periodicals: Incorporating World List of Scientific Periodicals : New Periodical Titles 1973. London: Butterworths, 1973.

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