(028073) Maas, Terry, and Sipperly, David. Freedive!. Ventura, CA: BlueWater Freedivers, 1998. 1st Edition. Hardcover. 4to. 152 pages. Fine in Fine DJ. Color Photographs. A Complete Guide To Breath-hold Diving. ISBN: 0964496615 (Sports) (Skin Diving, Spear Fishing, Underwater Photography)