Dyfyniad APA

Shepherd, W., & Shepherd, D. W. (2003). Energy studies (2nd ed.). Imperial College Press.

Dyfyniad Arddull Chicago

Shepherd, W., and D. W. Shepherd. Energy Studies. 2nd ed. London [England]: Imperial College Press, 2003.

Dyfyniad MLA

Shepherd, W., and D. W. Shepherd. Energy Studies. 2nd ed. Imperial College Press, 2003.

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