Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

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