Dyfyniad APA

Foster, A. D. Ghosts of Yesterday. Del Rey Books.

Dyfyniad Arddull Chicago

Foster, Alan Dean. Ghosts of Yesterday. Del Rey Books.

Dyfyniad MLA

Foster, Alan Dean. Ghosts of Yesterday. Del Rey Books.

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