Cita APA (7a ed.)

Johnston, I. M. (1927). A revision of the south american boraginoideae. Harvard University.

Cita Chicago Style (17a ed.)

Johnston, Ivan M. A Revision of the South American Boraginoideae. Massachusetts: Harvard University, 1927.

Cita MLA (8a ed.)

Johnston, Ivan M. A Revision of the South American Boraginoideae. Harvard University, 1927.