Donzellini, Giuliano, author
Springer Cham, 2019
eBooks
Hill, Fredrick J., author
John Wiley & Sons, 1978
Buku Teks
Roth, Charles H., author
Cengage Learning, 2018
Buku Teks
Friedman, Robert D.
The Conservation Foundation, 1981
Buku Teks
Foulonneau, Muriel, author
Chandos Publishing, 2008
Buku Teks