APA

Keller R., . (2004). Identification of tropical woody plants in the absence of flowers. Therwil, Switzerland: Birkhäuser Verlag.

Chicago

Keller Roland, . 2004. Identification of tropical woody plants in the absence of flowers. Therwil, Switzerland: Birkhäuser Verlag.

Harvard

Keller R., . (2004). Identification of tropical woody plants in the absence of flowers. Therwil, Switzerland: Birkhäuser Verlag.

MLA

Keller Roland, . Identification of tropical woody plants in the absence of flowers. Therwil, Switzerland: Birkhäuser Verlag. 2004.