Carr, Chris J.
Blacstone Press , 1989
Buku Teks
editors, Marcus D. Flather, Deepak L. Bhatt, Tobias Geisler
Blackwell , 2013
eBooks
Underhill, H.C. [Harry Clay], 1858-1918
Bobbs-Merrill , [19--?]
Buku Klasik
Burgess Publishing, 1971
Buku Teks SO
Burgess Publishing, 1971
Buku Teks SO