Hiroo, Sato, author
International House of Japan, 2016
Buku Teks
McIntosh, Jane, author
Checkmark Books, 1999
Buku Referensi
Pearl, Richard M.
McGraw-Hill, 1955
Buku Teks
Mathews, M. M.
Henry Holt, 1956
Buku Teks
Cabanellas, Guillermo, author
VCH, 1991
Buku Teks