Rugh, K. (2004). Labrador retrievers. Hoboken, N.J: Howell Book House.
Trích dẫn kiểu ChicagoRugh, Karla. Labrador Retrievers. Hoboken, N.J: Howell Book House, 2004.
MLA引文Rugh, Karla. Labrador Retrievers. Hoboken, N.J: Howell Book House, 2004.
警告：這些引文格式不一定是100％准確.