Parker, G.J.
Linguistic Circle of Canberra, 1970
Buku Teks SO
compiled by Howard P. McKaughan, Batua A. Macaraya
University of Hawaii Press, 1967
Buku Referensi
Peter Salim
Modern English Press , 1997
Buku Referensi
Wolff, John U., compiler
Cornell University, 1972
Buku Referensi
Palmer, E.H.
Routledge & Kegan Paul, 1956
Buku Referensi