Dyfyniad APA

(2001). Professional guide to signs & symptoms. Springhouse, Pa: Springhouse Corp.

Dyfyniad Arddull Chicago

Professional Guide to Signs & Symptoms. Springhouse, Pa: Springhouse Corp, 2001.

Dyfyniad MLA

Professional Guide to Signs & Symptoms. Springhouse, Pa: Springhouse Corp, 2001.

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