Dyfyniad APA

Levitt, I. M., & Cole, D. M. (1963). Exploring the secrets of space: Astronautics for the layman. Prentice-Hall.

Dyfyniad Arddull Chicago

Levitt, I. M., and Dandridge M. Cole. Exploring the Secrets of Space: Astronautics for the Layman. Englewood Cliffs, N.J.: Prentice-Hall, 1963.

Dyfyniad MLA

Levitt, I. M., and Dandridge M. Cole. Exploring the Secrets of Space: Astronautics for the Layman. Prentice-Hall, 1963.

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