Não informado. (1981). ACP observer. American College of Physicians.
Style de citation Chicago (17e éd.)Não informado. ACP Observer. Philadelphia, Pa: American College of Physicians, 1981.
Style de citation MLA (8e éd.)Não informado. ACP Observer. American College of Physicians, 1981.
Attention : ces citations peuvent ne pas être correctes à 100%.