Petikan APA

Walcott, C. D. 1. (1898). Cambrain Brachiopoda: Obolus and Lingulella, with description of new species.. Washington: Gov't print. off..

Petikan Gaya Chicago

Walcott, Charles D. 1850-1927. Cambrain Brachiopoda: Obolus and Lingulella, With Description of New Species.. Washington: Gov't print. off., 1898.

Petikan MLA

Walcott, Charles D. 1850-1927. Cambrain Brachiopoda: Obolus and Lingulella, With Description of New Species.. Washington: Gov't print. off., 1898.

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