editor Derek Bingham
John Catt Educational, 1994
Buku Referensi
Steinhauer, Hein, author
Faculty of Humanities University of Indonesia, 2011
Artikel Jurnal
edited by The Tsuneta Yano Memorial Society
The Kokusei-Sha, 1994
Buku Teks
Tucker, Allen B., author
McGraw-Hill, 1986
Buku Teks
Tucker, Allen B., author
McGraw-Hill, 1977
Buku Teks