What references were used?

“The End of the Imperial Japanese Navy” by Masanori Ito; W.W. Norton & Co; New York; 1962.

“Imperial Japanese Navy Submarines 1941-45” by Mark Stille; Osprey Publishing Ltd.; Botley, Oxford, U.K.; 2007

“The Japanese Navy in World War II: In the Words of Former Japanese Naval Officers”, by David C. Evans, ed. and trans.; Naval Institute Press; Annapolis, MD; 1986

“The Japanese Submarine Force and World War II” by Carl Boyd and Akihito Yoshida; Naval Institute Press; Annapolis, MD; 1995

“The Pacific Campaign, the U.S.-Japanese Naval War 1941-45” by Dan van der Vat; Touchstone; New York; 1991

“Submarines of the Imperial Japanese Navy” by Dorr Carpenter and Norman Polmar; Naval Institute Press; Annapolis, MD; 1986

“Suicide Submarine” by Yutaka Yokota and Joseph D. Harrington, (formerly “The Kaiten Weapon”); Ballantine Books; New York; 1962

“Sunk; The Story of the Japanese Submarine Fleet 1941-1945” by Mochitsura Hashimoto; Cassell and Company, Ltd.; London; 1954

http://www.navweaps.com/Weapons/WTJAP_WWII.php;

Wikipedia entry for “Emperor Jimmu”