Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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