Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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