Krejčl, J. (1970). Systematics, The journal of the Institute for the Comparative Study of History, Philosophy and the Science: Cultural the streams from the ice age to the 21st century. Surrey, Eng.
Chicago-tyylinen lähdeviittausKrejčl, Jaroslav. Systematics, The Journal of the Institute for the Comparative Study of History, Philosophy and the Science: Cultural the Streams From the Ice Age to the 21st Century. Surrey, Eng, 1970.
MLA-viiteKrejčl, Jaroslav. Systematics, The Journal of the Institute for the Comparative Study of History, Philosophy and the Science: Cultural the Streams From the Ice Age to the 21st Century. Surrey, Eng, 1970.
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