Orwell, George, 1903-1950, author
Penguin Books, 1955
Buku Teks
Pandey, B.N., author
Tata McGraw-Hill, 2012
Buku Teks
Rheza Maulana, author
Sekolah Ilmu Lingkungan Universitas Indonesia, 2019
UI - Tesis (Membership)
P.F. Larsen, editor
Wageningen Academic;Wageningen Academic, 2012
eBooks
Raden Ngabehi Tirtapraja, author
Tan Khoen Swie, 1885
Buku Klasik