Dyfyniad APA

JESSOP, N. (1970). Biosphere: A study of life. Prentice-hall.

Dyfyniad Arddull Chicago

JESSOP, N.M. Biosphere: A Study of Life. New Jersey: Prentice-hall, 1970.

Dyfyniad MLA

JESSOP, N.M. Biosphere: A Study of Life. Prentice-hall, 1970.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.