Dyfyniad APA

O'Sullivan, A. (2012). Urban economics (8th edition.). McGraw-Hill/Irwin.

Dyfyniad Arddull Chicago

O'Sullivan, Arthur. Urban Economics. 8th edition. New York, NY: McGraw-Hill/Irwin, 2012.

Dyfyniad MLA

O'Sullivan, Arthur. Urban Economics. 8th edition. McGraw-Hill/Irwin, 2012.

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