1. ASTM., 1968 . Special Technical Publication No. 434 , p.61 . American Society for Testing and Materials, Philadelphia, Pa.
2. R.E. Berry, and W.L. Bryan, 1974 . Proceedings 4th International Congres of Food Science and Technology . Madrid, Spain, Sept. 23-27.
3. Analysis of Valencia orange essence and aroma oils
4. S. Dal Nogare, and R.S. Juvet, 1962 . "Gas Liquid Chromatography ," p.220 , Interscience, New York. New York.