APA

Krukoff B. A., Barneby R. C., . (1969). Supplementary notes on the American species of strychnos. VIII. Bronx, New York: The New York Botanical Garden.

Chicago

Krukoff B A, Barneby R C, . 1969. Supplementary notes on the American species of strychnos. VIII. Bronx, New York: The New York Botanical Garden.

Harvard

Krukoff B. A., Barneby R. C., . (1969). Supplementary notes on the American species of strychnos. VIII. Bronx, New York: The New York Botanical Garden.

MLA

Krukoff B A, Barneby R C, . Supplementary notes on the American species of strychnos. VIII. Bronx, New York: The New York Botanical Garden. 1969.