Mersbergen, Jan van
Cossee, 2007
Buku Teks
Eckbo, Garrett, author
McGraw-Hill, 1969
Buku Teks
Martin, Chuck, author
American Management Association, 2007
eBooks
Carmiggelt, Simon, 1913-, author
de Arbeiderspers, 1963
Buku Teks
Parsch, Pius, author
Fides, 1962
Buku Teks