Sullivan, Jeremian M.
Jakarta : Biro Pusat Statistik, 1982,
Buku Referensi
Hope, A.D. (Alec Derwent), 1907-2000, author
Oxford University Press, 1975
Buku Teks
Petersen, William, author
Macmillan, 1961
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks
Petersen, William, author
Macmillan, 1969
Buku Teks