APA

Cowan R. S., Organization for Flora Neotropica (New York), . (1967). Swartzia (Leguminosac, caesalpinioideae swartzieae). New York, New York, United States: Hafner.

Chicago

Cowan Richard S, Organization for Flora Neotropica (New York), . 1967. Swartzia (Leguminosac, caesalpinioideae swartzieae). New York, New York, United States: Hafner.

Harvard

Cowan R. S., Organization for Flora Neotropica (New York), . (1967). Swartzia (Leguminosac, caesalpinioideae swartzieae). New York, New York, United States: Hafner.

MLA

Cowan Richard S, Organization for Flora Neotropica (New York), . Swartzia (Leguminosac, caesalpinioideae swartzieae). New York, New York, United States: Hafner. 1967.