Oparin, A. I. (1968). The origin and initial development of life. National Aeronautics and Space Administration ; for sale by the Clearinghouse for Federal Scientific and Technical Information.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Oparin, Aleksandr Ivanovich. The Origin and Initial Development of Life. [Washington, D.C.] : Springfireld, Va.: National Aeronautics and Space Administration ; for sale by the Clearinghouse for Federal Scientific and Technical Information, 1968.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Oparin, Aleksandr Ivanovich. The Origin and Initial Development of Life. National Aeronautics and Space Administration ; for sale by the Clearinghouse for Federal Scientific and Technical Information, 1968.
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