Fitch, J. M. (1984). Earth and astronomical sciences research centres: A world directory of organizations and programmes. Longman ; Distributed exclusively in USA, its possessions, and Canada by Gale Research Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Fitch, Jennifer M. Earth and Astronomical Sciences Research Centres: A World Directory of Organizations and Programmes. Harlow, Essex, UK : Detroit, MI, USA: Longman ; Distributed exclusively in USA, its possessions, and Canada by Gale Research Co., 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Fitch, Jennifer M. Earth and Astronomical Sciences Research Centres: A World Directory of Organizations and Programmes. Longman ; Distributed exclusively in USA, its possessions, and Canada by Gale Research Co., 1984.
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