Dupree, Dempsey
Addison-Wesley Pub. Co., 1984
Buku Teks
Wilkins, Ernest Hatch
Harvard University , 1954
Buku Teks
Rodriguez, Deborah, author
Sphere, 2014
Buku Teks
Library Association Publishing, 1994
Buku Referensi
Library Association, 1982
Buku Referensi