Farrell, E. J. (1976). Fantasy: Shapes of things unknown. Scott, Foresman &Co.
Cita Chicago Style (17a ed.)Farrell, Edmund J. Fantasy: Shapes of Things Unknown. Illinois, Estados Unidos: Scott, Foresman &Co, 1976.
Cita MLA (9a ed.)Farrell, Edmund J. Fantasy: Shapes of Things Unknown. Scott, Foresman &Co, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.