on July 23, 1948, Unʾyushō Tetsudō Sōkyoku was separated from Unʾyushō
Its Kokutetsu jidōsha nijūnenshi, 1951.
Eki bunka o kangaeru, 1988 (name not given)
Shokuinroku, 1988 v. 1, p. 2301 (Nihon Kokuyū Tetsudō under Higashi Nihon Ryokaku Tetsudō Kabushiki Kaisha; 1987, the heading divided into Higashi Nihon Ryokaku Tetsudō Kabushiki Kaisha and [5 other bodies])
Kojima, I. JR Tōkai chōsensuru keiei, 1990 (name not given)
Shokuinroku, 1989 v. 1, p. 2309 (Nihon Kokuyū Tetsudō under Tōkai Ryokaku Tetsudō Kabushiki Kaisha; 1987, the heading divided into Tōkai Ryokaku Tetsudō Kabushiki Kaisha and [5 other bodies])
Miyamoto, A. JR Nishi Nihon ga kawaru, 1993 p. 1 (Nishi Nihon Ryokaku Tetsudō Kabushiki Kaisha; former Nihon Kokuyū Tetsudo divided into 7 JR companies, 4/87; loc. Osaka, Japan)
A year book of JNR information, 1956 t.p. (Japanese National Railways)