Rolfes, Sharon Rady, author
Wadsworth and Cengage Learning, 2012
Buku Teks
Riyanto Dwihatma Setyawan, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2011
UI - Skripsi (Open)
Korean National Tourism Corporation, [date of publication not identified]
Buku Referensi
Foreign Languages Publishing House, 1957
Buku Teks
Berton, Pierre
McClelland and Stewart, 1983
Buku Teks