Armstrong, Michael, author
[Publisher not identified], [Date of publication not identified]
Buku Teks
May, John
McGraw-Hill , 1983
Buku Teks
Regina Pinasthika Hapsari Putri, author
Universitas Indonesia, 2014
UI - Tugas Akhir
Hynes, Geraldine E.
McGraw-Hill, 2004
Buku Teks
Adair, John, author
Pustaka Binaman Pressindo, 1984
Buku Teks