Hutchinson, 1959
Buku Referensi
Rossi, Renzo, author
Macmillan, 1996
Buku Referensi
edited by Selden Rodman
Mentor Book , 1960
Buku Teks
editor in-chief, Joel H. Silbey
Charles Scribner`s Sons, Legislative bodies
Buku Referensi
editor in-chief, Joel H. Silbey
Charles Scribner`s Sons, 1994
Buku Referensi