1. American Society of Agricultural Engineers, 1983. Methods of determining and expressing fineness of feed materials by sieving. Page 325 in: American Society of Agricultural Engineers Standard S319. Yearbook Standards, American Society of American Engineers, St. Joseph, MI.
2. Official Methods of Analysis,1984
3. The morphology and distribution of cutaneous mechanoreceptors (Herbst and Grandy corpuscules) in bill and tongue of the mallard (Anas platyrhynchos L.);Berkhoudt;Neth. J. Zool.,1980
4. Structure and function of avian taste receptors;Berkhoudt,1985
5. The relative value of pellets versus mash and grain in poultry;Calet;World’s Poult. Sci. J.,1968