Roelofs, H. Mark
The Dorsey press, 1968
Buku Teks
Strong, C.F., author
Sidgwick & Jackson Limited, 1960
Buku Teks
Reinsch, Paul S.
Commercial Press, 1921
Buku Teks
Strong, C. F., author
Nuansa, 2004
Buku Teks
by Carlton Clymer Rodee ... [et al.]
McGraw-Hill, 1983
Buku Teks