De Groen, Alma, 1941-
Currency, 1988
Buku Teks SO
National Geographic Society, 1984
Buku Referensi
Canot, Robert
New York Bantam Books c 1967
Buku Teks
Thoreau, Henry David, 1817-1862
Library of America, 1985
Buku Teks
edited by M. Monirul Qader Mirza, Ahsan Uddin Ahmed, Qazi Kholiquzzaman Ahmad
CRC Press, Taylor & Francis Group, 2008
Buku Teks