Andalusia Martha Novaline, author
Fakultas Teknik Universitas Indonesia, 2012
UI - Skripsi (Open)
Shelly Rodgers and Esther Thorson
Routledge, 2012
Buku Teks
Moriarty, Sandra E. (Sandra Ernst), author
Prentice Hall International, 1991
Buku Teks
Sissors, Jack Z
NTC Businness Books, 1993
Buku Teks
Duffy, Ben
Prentice-Hall, 1957
Buku Teks