Dyfyniad APA

American Foundation for Continuing Education. (1963). Exploring the universe. McGraw-Hill Book Co., Inc.

Dyfyniad Arddull Chicago

American Foundation for Continuing Education. Exploring the Universe. New York: McGraw-Hill Book Co., Inc, 1963.

Dyfyniad MLA

American Foundation for Continuing Education. Exploring the Universe. McGraw-Hill Book Co., Inc, 1963.

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