Sigit, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2013
UI - Skripsi (Membership)
Schellecnberg, T.R., author
University of Chicago Press , 1956
Buku Teks
Saroso Wirodihardjo, author
GKBI, 1954
Buku Teks
Newmeyer, Sarah, author
New American Library , 1955
Buku Teks
Arnason, H. Harvard, author
Thames & Hudson, 1998
Buku Referensi