editors, Tim Halliday, Kraig Adler
Facts on File, 1994
Buku Referensi
editors, Tim Halliday, Kraig Adler, Christopher O'toole
Grolier International, 1993
Buku Referensi
edited by C. Kenneth Dodd
Oxford University Press, 2016
eBooks
Rothschild, Bruce M., author
Springer, 2012
eBooks
Peter H. Raven
McGraw-Hill, Higher Education, 2008
Buku Teks