Lion, Edgar, author
John Wiley & Sons, 1976
Buku Teks
edited Charles R. Blitzer, Peter B. Clark and Lance Taylor
Oxford University Press, 1977
Buku Teks
Harbison, Frederick Harris, author
International Institute for Educational Planning Unesco , 1967
Buku Teks
Lewis, William Arthur, 1915-, author
Harper & Row, 1966
Buku Teks
Soroy Lardo, author
Universitas Pertahanan, 2020
Artikel Jurnal