Algra, N.E., author
Wolters-Noordhoff N.V., 1970
Buku Teks
Sneep, J.C.
Kluwer, [date of publication not identified]
Buku Teks
Kakebeeke-van der put, M.A.
Kluwer, 1970
Buku Teks
Algra, Nikolaas Egbert, author
Noordhoff, 1969
Buku Teks
Algra, Nikolaas Egbert, author
Wolters-Noordhoff, 1986
Buku Teks