EXCEL BOOKS. (2001). PERSONAL COMPUTER: SOFTWARE. EXCEL BOOK.
Dyfyniad Arddull ChicagoEXCEL BOOKS. PERSONAL COMPUTER: SOFTWARE. NEW DELHI: EXCEL BOOK, 2001.
Dyfyniad MLAEXCEL BOOKS. PERSONAL COMPUTER: SOFTWARE. EXCEL BOOK, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.