Simonds, John Ormsbee, author
McGraw-Hill, 1994
Buku Teks
Scott Ian
The John Hopkins University Press , 1982
Buku Teks
Simonds, John Ormsbee, author
McGraw-Hill , 1994
Buku Teks
Newland, Kathleen, author
Worldwatch Institute, 1980
Buku Teks
edited by Mirjana Ristic and Sybille Frank
Routledge, 2019
Buku Teks