Cita APA

Shepherd, W., & Shepherd, D. W. (2008). Problems and solutions: Energy studies. Imperial College Press.

Chicago Edition Citation

Shepherd, W., i D W. Shepherd. Problems and Solutions: Energy Studies. London: Imperial College Press, 2008.

Cita MLA

Shepherd, W., i D W. Shepherd. Problems and Solutions: Energy Studies. Imperial College Press, 2008.