Palsson, Lennart, 1933-, author
Sijthoff, 1974
Buku Teks
Scoles, Eugene F., author
West Publishing, 1967
Buku Teks
Reese, Willis L.M., author
Foundation Press, 1971
Buku Teks
Kay, Herma Hill, author
Harcourt Brace & Company, 1990
Buku Teks
edited by Lawrence Collins
Stevens, 1973
Buku Teks