Bassis, Michael S., author
McGraw-Hill, 1991
Buku Teks
O`Donnell, Gerard, author
Macmillan, 1994
Buku Teks
Cuff, E.C., author
Routledge, 1995
Buku Teks
edited by E.C. Cuff; G.C.F. Payne
George Allen and Unwin, 1984
Buku Teks
Roucek, Joseph S., author
Littlefield, Adam, 1963
Buku Teks