References
- MINISTRY OF AGRICULTURE, FORESTRY AND FISHERIES (1979). Agriculture and Food in Japan. MAFF.
- MINISTRY OF AGRICULTURE, FORESTRY AND FISHERIES (1985). Statistics on Animal Production and improvements, MAFF.
- MICHIO SUGIYAMA (1978). Economic consideration on the Developments of the Poultry Industry in Japan. Research Bulletin of the Faculty of Agriculture, Gifu University No. 41.
- MICHIO SUGIYAMA (1980). Economic considerations on Poultry Development in Japan II, Case studies on Coop type Poultry Farm. Japan Poultry Science Vol. 72–2.
- MICHIO SUGIYAMA (1984). Economic Considerations on the Development of Poultry Industry III. Case studies on Integrated Egg Production. Proceedings 5th World's Poultry Congress, Helsinki.
- MICHIO SUGIYAMA Japan Situation and Outlook Report – International Egg Market Review (Various issues). International Egg Commission.
- POULTRY INTERNATIONAL. Country File: Japan. Poultry International Vol. 24. March 1985