Cita APA (7a ed.)

Parry, V. F. (1950). Production, classification and utilization of Western United States coals.

Cita Chicago Style (17a ed.)

Parry, V. F. Production, Classification and Utilization of Western United States Coals. 1950.

Cita MLA (8a ed.)

Parry, V. F. Production, Classification and Utilization of Western United States Coals. 1950.