Cita APA

Holmgren, P. M. K. 1., & Keuken, W. (1974). The herbaria of the world (Sixth edition.). Utrecht, Netherlands: Oosthoek, Scheltema & Holkema.

Citación estilo Chicago

Holmgren, Patricia May Kern 1940-, y Wil Keuken. The Herbaria of the World. Sixth edition. Utrecht, Netherlands: Oosthoek, Scheltema & Holkema, 1974.

Cita MLA

Holmgren, Patricia May Kern 1940-, y Wil Keuken. The Herbaria of the World. Sixth edition. Utrecht, Netherlands: Oosthoek, Scheltema & Holkema, 1974.