Παραπομπή APA

Loughlin, G. F. 1. (1921). Mineral resources of the United States, 1918. Washington: Government Printing Office.

Παραπομπή Chicago Style

Loughlin, G. F. 1880-1946. Mineral Resources of the United States, 1918. Washington: Government Printing Office, 1921.

Παραπομπή MLA

Loughlin, G. F. 1880-1946. Mineral Resources of the United States, 1918. Washington: Government Printing Office, 1921.

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