Young, Jeffrey E.
Guilford Press, 2003
Buku Teks
Harsoyo
Majalah Mingguan Berita Pajak , 1974
Buku Teks
Merli, Mauro
Qe, 2013
Buku Teks
Verstegen, Judicus
Em. Querido's, 1970
Buku Teks
edited by Robert A. Brown and Joan Roberts Field
PMA Publishing, 1988
Buku Teks