Dyfyniad APA

Perkins, H. C. (1974). Air pollution (International student ed.). McGraw-Hill Kogakusha.

Dyfyniad Arddull Chicago

Perkins, Henry C. Air Pollution. International student ed. Tokyo: McGraw-Hill Kogakusha, 1974.

Dyfyniad MLA

Perkins, Henry C. Air Pollution. International student ed. McGraw-Hill Kogakusha, 1974.

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