APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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