Hertwig, R. (1916). Lehrbuch der Zoologie.
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Dyfyniad Arddull Chicago
Hertwig, Richard. Lehrbuch Der Zoologie. Jena, 1916.
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Dyfyniad MLA
Hertwig, Richard. Lehrbuch Der Zoologie. 1916.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.