Steinberg, Christian E.W., author
Springer, 2012
eBooks
Monosson, Emily, author
Island Press, 2012
eBooks
Kelly, Mahlon G., author
Houghton Miffiln, 1975
Buku Teks
edited by Bernard Stonehouse and Christopher M. Perrins
University Park Press, 1979
Buku Teks
Geist, Valerius, author
Springer, 1978
Buku Teks