Cita APA (7th ed.)

Krevelen, D. W. v. (1957). Coal science: Aspects of coal constitution. Elsevier.

Cita Chicago (17th ed.)

Krevelen, D. W van. Coal Science: Aspects of Coal Constitution. Amsterdam: Elsevier, 1957.

Cita MLA (9th ed.)

Krevelen, D. W van. Coal Science: Aspects of Coal Constitution. Elsevier, 1957.