Dyfyniad APA

Indian Standards Institution. (1980). Sectional list of Indian Standards: : petroleum, coal and related products. Indian Standards Institution.

Dyfyniad Arddull Chicago

Indian Standards Institution. Sectional List of Indian Standards: : Petroleum, Coal and Related Products. N.Delhi: Indian Standards Institution, 1980.

Dyfyniad MLA

Indian Standards Institution. Sectional List of Indian Standards: : Petroleum, Coal and Related Products. Indian Standards Institution, 1980.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.