Dyfyniad APA
Heller, L. (2012). Sign language: A,b,c. Sterling Children's Books.
Dyfyniad Arddull Chicago
Heller, Lora. Sign Language: A,b,c. New York: Sterling Children's Books, 2012.
Dyfyniad MLA
Heller, Lora. Sign Language: A,b,c. Sterling Children's Books, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.