Cita APA (7a ed.)

Karr, C.. (1978). Analytical methods for coal and coal products. Academic Press.

Cita Chicago Style (17a ed.)

Karr, Clarence. Analytical Methods for Coal and Coal Products. New York [etc.]: Academic Press, 1978.

Cita MLA (9a ed.)

Karr, Clarence. Analytical Methods for Coal and Coal Products. Academic Press, 1978.