Rees, N. (1995). The Guinness dictionary of jokes. Guinness Publishing.
Dyfyniad Arddull ChicagoRees, Nigel. The Guinness Dictionary of Jokes. Enfield: Guinness Publishing, 1995.
Dyfyniad MLARees, Nigel. The Guinness Dictionary of Jokes. Guinness Publishing, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.