Middleton, Beth, author
John Wiley & Sons, 1999
Buku Teks
Gosse, Edmund, 1849-1928
J.M. Dent, 1950
Buku Teks
Abdul Malik Sadat Idris, author
Badan Perencanaan Pembangunan Nasional (BAPPENAS), 2019
Artikel Jurnal
Trasar-Cepeda, Carmen, editor
Springer, 2012
eBooks
Charles T. Roman, editor
Island Press, 2012
eBooks