Gaya APA

Karr, C, J. (1978). Analytical Methods for Coal and Coal Products Vol. 2 (II) (E-Book) . United States of America: Academic Press Inc.

Gaya MLA

Karr, Clarence, Jr. "Analytical Methods for Coal and Coal Products Vol. 2 (II) (E-Book)". United States of America: Academic Press Inc, 1978. E-book.