d`Alpuget, Blanche
Aurora Press, 1980
Buku Teks
Williams, Duncan
Delta Book , 1971
Buku Teks
Freiman, Marcelle
Island, 1951
Buku Teks
Weidenreich, Franz, 1873-1948
The University of Chicago Press , 1946
Buku Teks
Sinaga, Tuntun
Universitas Indonesia, 1998
UI - Tesis (Membership)