Singer, S. F. (1979). Energy. California: W.H.Freeman And Company.
Chicago Style aipamenaSinger, S. Fred. Energy. California: W.H.Freeman And Company, 1979.
MLA aipamenaSinger, S. Fred. Energy. California: W.H.Freeman And Company, 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.