APA استشهاد

Roy, A. E., & Clarke, D. (1978). Astronomy: Structure of the universe. Adams and Higler.

استشهاد بنمط شيكاغو

Roy, A E., و D. Clarke. Astronomy: Structure of the Universe. Bristol: Adams and Higler, 1978.

MLA استشهاد

Roy, A E., و D. Clarke. Astronomy: Structure of the Universe. Adams and Higler, 1978.