PEATA. (1997). Handbook and Guide on DC Regulations, 4th Printing. PEATA Publications.
Dyfyniad Arddull ChicagoPEATA. Handbook and Guide on DC Regulations, 4th Printing. PEATA Publications, 1997.
Dyfyniad MLAPEATA. Handbook and Guide on DC Regulations, 4th Printing. PEATA Publications, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.