APA

Hagel J., . (1976). Alternative energy strategies. New York, NY [u.a.]: Praeger Publ.

Chicago

Hagel John, . 1976. Alternative energy strategies. New York, NY [u.a.]: Praeger Publ.

Harvard

Hagel J., . (1976). Alternative energy strategies. New York, NY [u.a.]: Praeger Publ.

MLA

Hagel John, . Alternative energy strategies. New York, NY [u.a.]: Praeger Publ. 1976.