Dyfyniad APA

Hancock, G., Bauval, R., & Grigsby, J. (1998). The Mars mystery: A tale of the end of two worlds. Michael Joseph.

Dyfyniad Arddull Chicago

Hancock, Graham, Robert Bauval, and John Grigsby. The Mars Mystery: A Tale of the End of Two Worlds. London: Michael Joseph, 1998.

Dyfyniad MLA

Hancock, Graham, et al. The Mars Mystery: A Tale of the End of Two Worlds. Michael Joseph, 1998.

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