APA (7th ed.) Citation

Shepherd, W., & Shepherd, D. W. (1998). Energy studies. Imperial College Press.

Chicago Style (17th ed.) Citation

Shepherd, William, and D. William Shepherd. Energy Studies. [London]: Imperial College Press, 1998.

MLA (9th ed.) Citation

Shepherd, William, and D. William Shepherd. Energy Studies. Imperial College Press, 1998.