Heath, Robert W.
Harper and Row, 1964
Buku Teks
editor, Benny YP Siahaan
KJRI New York, 2016
Buku Teks
Berman, Louise M., author
Charles E. Merrill, 1968
Buku Teks
Tyler, Ralph W.
University of Chicago, 1949
Buku Teks
Departemen Penerangan, 1977
Buku Teks