Cita APA (7a ed.)

Underwood, G. (1967). A contribution to the classification of snakes.

Cita Chicago Style (17a ed.)

Underwood, Garth. A Contribution to the Classification of Snakes. London - INGL, 1967.

Cita MLA (8a ed.)

Underwood, Garth. A Contribution to the Classification of Snakes. 1967.