Cita APA (7a ed.)

Pruitt, W. O., Jr. (1970). Some ecological aspects of snow. [s.n.].

Cita Chicago Style (17a ed.)

Pruitt, William O., Jr. Some Ecological Aspects of Snow. [S.l.]: [s.n.], 1970.

Cita MLA (9a ed.)

Pruitt, William O., Jr. Some Ecological Aspects of Snow. [s.n.], 1970.