Shepherd, W., & Shepherd, D. W. (2008). Problems and solutions: Energy studies. Imperial College Press.
Chicago Style aipamenaShepherd, W., and D W. Shepherd. Problems and Solutions: Energy Studies. London: Imperial College Press, 2008.
MLA aipamenaShepherd, W., and D W. Shepherd. Problems and Solutions: Energy Studies. Imperial College Press, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.