Lee, Alfred McClung
Rinehart & Company, 1953
Buku Teks
Elkin, A. P., author
Angus and Robertson, 1966
Buku Teks
Elkin, A. P., author
Angus and Robertson, 1956
Buku Teks
McKay, William R., author
Pearson Education , 2011
Buku Teks
Marshall, Peter, author
Glorier International, 2001
Buku Referensi