Hanson, A.H.
London Routledge & Kegan Paul 1959,
Buku Teks
Hansen, A. H.
Routledge , 1965
Buku Teks
Koontz, Harold, author
McGraw-Hill, 1956
Buku Teks
Swerdlow, Irving, author
Frederick A. Praeger, 1975
Buku Teks
Hanson, A.H.
Oxford University Press, 1966
Buku Teks