Hill, Napoleon, author
Ramala Books, 2007
Buku Teks
Hill, Napoleon, author
Binarupa Aksara, 1994
Buku Teks
Scott, Steven K.
Think, 2006
Buku Teks
Poissant, Charles-Albert
Pustaka Tangga, 1993
Buku Teks
Oech, Roger Von, author
Bhuana Ilmu Populer, 2008
Buku Teks