Rouse, Biair
New York Twayne 1962
Buku Teks
Eeden, Frederik van
W. Wersluys, [date of publication not identified]
Buku Teks
Maddala, G.S.
McGraw-Hill Book , 1989
Buku Teks
Rosen, Ellen Doree
Sage Publications, 1993
Buku Teks
Warmond, Ellen, 1930-2011
Querido, 1966
Buku Teks