Buku Teks
Hallgarten, George W.F. (George Wolfgang Felix), |d 1901-1975
Macmillan, 1954
Buku Teks
selected and translated with an introduction by Jaihiun J. Kim
Hanshin, 1986
Buku Teks
Akiko Sato Oishi, author
The Japan Institute for Labour Policy and Training, 2019
Artikel Jurnal
Thayer, Nathaniel B.
Princeton University Press, 1973
Buku Teks