Gaya APA

Karr, C, J. (1979). Analytical Methods for Coal and Coal Products Vol. 3 (III) (E-Book) . United States of America: Academic Press Inc.

Gaya MLA

Karr, Clarence, Jr. "Analytical Methods for Coal and Coal Products Vol. 3 (III) (E-Book)". United States of America: Academic Press Inc, 1979. E-book.