Cita APA (7a ed.)

Howard B. Sprague. (1959). Grasslands. Américan association for the advancement of science.

Cita Chicago Style (17a ed.)

Howard B. Sprague. Grasslands. Washington, DC: Américan association for the advancement of science, 1959.

Cita MLA (8a ed.)

Howard B. Sprague. Grasslands. Américan association for the advancement of science, 1959.