Read, H.H., author
ELBS and Macmillan, 1975
Buku Teks
Read, H.H., author
ELBS and Macmillan, 1975
Buku Teks
Energlyn, Lord
McGraw-Hill, 1973
Buku Teks
Katili, J. A., author
Departemen Urusan Reseaech Nasional , [date of publication not identified]
Buku Teks
edited by D. Poche, C.M. Woolheater
Burgess, 1967
Buku Teks