Van der Ziel, Aldert, 1910-
John Wiley & Sons, 1976
Buku Teks SO
Miller, Henry Arthur
Blackwell, 1994
Buku Teks
Francis, Thomas George
ELBS, 1992
Buku Teks SO
Francis, Thomas George
Longman, 1971
Buku Teks SO
Francis, Thomas George
Longman, 1988
Buku Teks SO