APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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