Labrador Retrievers Today (Carole Coode)

Advanced Labrador Breeding... also a second edition of the same book called: 

Reaching For The Stars (Mary Roslin Williams)

The Versatile Labrador Retriever (Nancy Martin)

Ledgends In Labradors (Nancy Martin)

The New Complete Labrador Retriever (Helen Warwick) 

The Labrador Retriever (Lisa Weiss Agresta)

The New Labrador Retriever (Janet Churchill)

The Labrador Quarterly (a subscription magazine for serious hobbiests) www.hoflin.com

Koehler Method of Dog Training (William Koehler)

Koehler Method of Open Obedience For Ring, Home, and Field (William Koehler)

Koehler Method of Utility Dog Training (William Koehler)

Water Dog (Richard Wolters)

Duck Dog (Richard Wolters)

Dog Owner's Home Veterinary Handbook (Carlson and Giffin)

U.C.Davis Book of Dogs (Mordecai Siegal)