Kwon, Yeo-sun
An Apollo Book, 2021
Buku Teks SO
Tsukakoshi, Hiroshi
Japan Japan Publishing Industry Foundation for Culture, 2015
Buku Teks
Shapcott, Thomas William, 1935-
Black Swan, 1988
Buku Teks SO
Vermeulen, Nico
Rebo International, 1994
Buku Referensi
Herrick, Glenn W. (Glenn Washington), 1870-1965
Comstock Publishing Company, 1935
Buku Teks