APA

Fernesworth N. R., Wagner H., . (1990). Economic and medicinal plant research. New York: Academic.

Chicago

Fernesworth Norman R, Wagner H, . 1990. Economic and medicinal plant research. New York: Academic.

Harvard

Fernesworth N. R., Wagner H., . (1990). Economic and medicinal plant research. New York: Academic.

MLA

Fernesworth Norman R, Wagner H, . Economic and medicinal plant research. New York: Academic. 1990.