Waung, W.S.K.
Heinemann Educational, 1971
Buku Teks SO
Wang, Chang-ling
Kwang Lu Publishing Service, 1984
Buku Teks SO
Schwartz, Harry
Atheneum, 1966
Buku Teks SO
Schwartz, Harry
Atheneum, 1966
Buku Teks SO
Schwartz, Harry
Atheneum, 1965
Buku Teks SO