Stevenson, Burton, author
New York, Harper & Brothers
Buku Referensi
Stevenson, Burton Egbert, author
New York, Dodd Mead
Buku Referensi
Watchtower Bible and Tract Society of New York , 2004
Buku Teks
Artikel Jurnal
Becker, Norman, author
McGraw-Hill, 2011
Buku Teks