APA

Berg C. C., Akkermans R. W. A. P. & Van Heusden E. C. H. (1990). Cecropiaceae: coussapoa and pourouma, with an introduction to the family. New York, New York, United States: The New York Botanical Garden.

Chicago

Berg C C, Akkermans R W A P and Van Heusden E C H. 1990. Cecropiaceae: coussapoa and pourouma, with an introduction to the family. New York, New York, United States: The New York Botanical Garden.

Harvard

Berg C. C., Akkermans R. W. A. P. and Van Heusden E. C. H. (1990). Cecropiaceae: coussapoa and pourouma, with an introduction to the family. New York, New York, United States: The New York Botanical Garden.

MLA

Berg C C, Akkermans R W A P and Van Heusden E C H. Cecropiaceae: coussapoa and pourouma, with an introduction to the family. New York, New York, United States: The New York Botanical Garden. 1990.