APA

Pennington T. D., Organization for Flora Neotropica (New York), . (1990). Sapotaceae. New York, New York, United States: The New York Botanical Garden.

Chicago

Pennington T D, Organization for Flora Neotropica (New York), . 1990. Sapotaceae. New York, New York, United States: The New York Botanical Garden.

Harvard

Pennington T. D., Organization for Flora Neotropica (New York), . (1990). Sapotaceae. New York, New York, United States: The New York Botanical Garden.

MLA

Pennington T D, Organization for Flora Neotropica (New York), . Sapotaceae. New York, New York, United States: The New York Botanical Garden. 1990.