Não informado. (2007). Report of the Penrose Research Laboratory. Zoological Society of Philadelphia.
Style de citation Chicago (17e éd.)Não informado. Report of the Penrose Research Laboratory. Philadelphia, Pa: Zoological Society of Philadelphia, 2007.
Style de citation MLA (8e éd.)Não informado. Report of the Penrose Research Laboratory. Zoological Society of Philadelphia, 2007.
Attention : ces citations peuvent ne pas être correctes à 100%.