Dobson, W. A. C. H.
University of Toronto Press, 1959
Buku Teks
Davis, H. W. C.
Oxford University Press, 1960
Buku Teks
Morris-Jones, W.H.
University of Pennsylvania press, 1957
Buku Teks
Staverman, W. H.
Meulenhoff, 1960
Buku Teks
Wiley, 1996
Buku Teks