Mooney, Gavin H.
Harvester Wheatsheaf, 1994
Buku Teks
Routledge, 2004
Buku Teks
Hood, Roger G.
McGraw-Hill, 1971
Buku Teks
Richards, Jack C.
Cambridge University Press, 2015
Buku Teks
by Robert A. Burton ... [et al.]
Harcourt Brace Jovanovich, 1978
Buku Teks