Heckmann, O. (1929). Photographische Vermessung der Sterngruppe Coma Berenices.
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Dyfyniad Arddull Chicago
Heckmann, Otto. Photographische Vermessung Der Sterngruppe Coma Berenices. Göttingen, 1929.
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Dyfyniad MLA
Heckmann, Otto. Photographische Vermessung Der Sterngruppe Coma Berenices. 1929.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.