References

Sweetpotatoes	Kenkichi Sakai	Housei University Press, 1999
How to cultivate sweetpotatoes	Kenkichi Sakai	Agricultural Production Fishing Village Culture Association, 1976
Sweetpotato information from I.M.O.	Distribution Horticulture Section, Agricultural Administration Department, Kagoshima Prefecture	vol. 1-5.
Potatoes - Blessings of the soil	Edited by Kiyochika Hoshikawa 1985	Publication department, Women's Nutrition College, 1985
History of sweetpotatoes	Masashi Kobayashi	Kokin Shoin, 1984
Potatoes and nutrition	Aya Kagawa	The Foundation of Development of Tuber and Root Crop, 1991
Current sweetpotato production by use, distribution structures and future tasks	Katsuji Watanabe	Local general research institute, Kagoshima College of Economics, vol. 24, No. 2, 1997
Data on potato production and distribution	Upland Crop Promotion Section, Agriculture Production and Horticulture Division, Ministry of Agriculture, Forestry and Fisheries, 1995.	1996
Information on potato promotion, first issue - No. 51	The Foundation of Development of Tuber and Root Crop, 1995.	〜1996
Information on potato promotion, Special issue "Present and future of sweetpotato-based processed foods"	ditto, 1995.	Information on potato promotion, Special issue
The healthy sweetpotato - Chinese medicine for the kitchen -	Michiyo Komuro	Nobunkyo, 1985
Japan's specialty agricultural products	Edited by the specialty Product Research Group, Upland Crop Promotion Section, Ministry of Agriculture, Forestry and Fisheries,	Chikyusha, 1987
Sweetpotatoes, potatoes, and other tubers	The Foundation of Development of Tuber and Root Crop.	1991
Sweetpotatoes which can be eaten whole	Hideyuki Takeda	Nobunkyo, 1989
Sweetpotato picture book	Hideyuki Takeda	Nobunkyo, 1997