Apel, Max, 1869-1945, author
Berlin : Walter de Gruyter, 1958
Buku Referensi
Warneck, Joh., author
Martinus Nijhoff, 1977
Buku Referensi
Elsevier, 2013
eBooks
Stoute, Rene
De Arbeiderspers, 1991
Buku Teks
Gabriel Possenti Shindunata, author
Gramedia, 2006
Buku Teks