Pelto, Pertti J.
Harper & Row, Publishers, 1970
Buku Teks
Pelto, Pertti J.
Cambridge University press, 1978
Buku Teks
Jufrizal, author
Graha Ilmu, 2018
Buku Teks
Pertti J, Pelto, author
Cambridge University Press, 2012
eBooks
Christie, Agatha, 1890-1976, author
Gramedia Pustaka, 2018
Buku Teks