Dyfyniad APA

North, G. (1997). Advanced amateur astronomy (2nd ed.). Cambridge University Press.

Dyfyniad Arddull Chicago

North, Gerald. Advanced Amateur Astronomy. 2nd ed. Cambridge: Cambridge University Press, 1997.

Dyfyniad MLA

North, Gerald. Advanced Amateur Astronomy. 2nd ed. Cambridge University Press, 1997.

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