Krevelen, D. W. v. (1957). Coal science: Aspects of coal constitution. Elsevier.
Citazione stile Chigago Style (17a edizione)Krevelen, D. W van. Coal Science: Aspects of Coal Constitution. Amsterdam: Elsevier, 1957.
Citatione MLA (9a ed.)Krevelen, D. W van. Coal Science: Aspects of Coal Constitution. Elsevier, 1957.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.