edited by Roger Owen & Bob Sutcliffe
Longman, 1972
Buku Teks SO
Centers, Richard
Routledge/Thoemmes Press, 1949
Buku Teks SO
Blackwell Publishing, 2004
Buku Teks SO
Moon, Parker Thomas
Macmillan, 1953
Buku Teks SO
Moon, Parker Thomas
Macmillan, 1947
Buku Teks SO