Roueche, Berton
Little, Brown, 1967
Buku Teks
McMillon, Bill, author
John Wiley & Sons, 1991
Buku Referensi
Mahmud Bangkaru, author
Banda Aceh Dinas Pariwisata Aceh 1996,
Buku Referensi
Fishkin, Rand, author
Penguin, 2018
Buku Teks
Flynn, Peter, author
International Thomson , 1995
Buku Teks SO