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Anonymous. 1961. Food Additives: What They Are/How They Are Used. Manufacturing Chemist's Association Incorporated. Washington, D.C.

Hughes, O. and M. Bennion. 1970. Food Preservation. IN Introductory Foods p. 449. Collar-MacMillan Limited; london.

Poore, H.D. 19 . Citrus Pectin. Bulletin 1323. United States Department of Agriculture Department Bulletin, Washington, DC.