Bretz, G. M., & Beck, T. (1977). George M. Bretz, photographer in the mines. University of Maryland Baltimore County Library.
Style de citation Chicago (17e éd.)Bretz, George M., et Tom Beck. George M. Bretz, Photographer in the Mines. [Catonsville]: University of Maryland Baltimore County Library, 1977.
Style de citation MLA (8e éd.)Bretz, George M., et Tom Beck. George M. Bretz, Photographer in the Mines. University of Maryland Baltimore County Library, 1977.
Attention : ces citations peuvent ne pas être correctes à 100%.