Walliser, O. H. (1986). Global bio-events: A critical approach. Springer-Verlag.
Tohutoru Chicago (17th ed.)Walliser, Otto H. Global Bio-events: A Critical Approach. Berlin ; New York: Springer-Verlag, 1986.
Tohutoro MLA (8th ed.)Walliser, Otto H. Global Bio-events: A Critical Approach. Springer-Verlag, 1986.
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