Howland, John L.
Macmillan, 1968
Buku Teks SO
Mulroney, Susan E.
Saunders/Elsevier, 2009
Buku Teks SO
Wilson, James A. [James Albert], 1929-
Macmillan, 1972
Buku Teks SO
Wilson, James A. [James Albert], 1929-
Macmillan, 1979
Buku Teks SO
Nation, James L.
CRC Press, Taylor & Francis Group, 2008
Buku Teks SO