APA

Porter D. M., . (1993). On the road to the origin with Darwin, Hooker, and Gray. Estados Unidos: Journal of the history of biology.

Chicago

Porter Duncan M, . 1993. On the road to the origin with Darwin, Hooker, and Gray. Estados Unidos: Journal of the history of biology.

Harvard

Porter D. M., . (1993). On the road to the origin with Darwin, Hooker, and Gray. Estados Unidos: Journal of the history of biology.

MLA

Porter Duncan M, . On the road to the origin with Darwin, Hooker, and Gray. Estados Unidos: Journal of the history of biology. 1993.