Perpustakaan Nasional RI , 2017
Artikel Jurnal
Black, Max
Cornell University Press, 1954
Buku Teks
Midgley, Derek, author
John Wiley & Sons, 1978
Buku Teks
Joyce, James, author
Penguin Books, 1961
Koleksi Publik
Allen, Walter
Longmans, 1953
Buku Teks