Pijper, F.
Amsterdam S.L. van Looy 1921
Buku Teks
Amsterdam : L.C.C. Malmberg, 'Shertogenbosch
Majalah, Jurnal, Buletin
Hare, Julius Charles
London John W. Parker & Son 1852
Buku Teks
Gladstone, W. E.
London John Murray 1879
Buku Teks
Peiping : The Catholic University Press
Majalah, Jurnal, Buletin