Geerts, S. (1952). Roeping en taak der biologie. Dekker & van de Vegt.
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Dyfyniad Arddull Chicago
Geerts, S.J. Roeping En Taak Der Biologie. Nijmegen, Utrecht: Dekker & van de Vegt, 1952.
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Dyfyniad MLA
Geerts, S.J. Roeping En Taak Der Biologie. Dekker & van de Vegt, 1952.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.