Lovelock, Christopher H., author
Pearson Education international, 2002
Buku Teks
Peters, Jan Hendrik, author
Trisakti University, 1999
Buku Teks
Lewis, Judith A., 1939-, author
Brooks/Cole, 2012
Buku Teks
edited by Bart van Looy and Roland van Dierdonck
Pitman, 1998
Buku Teks
Carlzon, Jan, author
Harper Collins Publishers, 1989
Buku Teks