Constitutional law cases and other problems
by Paul A. Freund [and others]
Little, Brown, 1966
 Buku Teks
Constitutional law cases and other problems; Volume II
by Paul A. Freund [and others]
Little, Brown, 1954
 Buku Teks
Current legal problems 1948 : vol. I
edited by George W. Keeton and Georg Schwarzenberger
Stevens and Sons, 1948
 Buku Teks
Gaa, Charles J.
Federal income taxation : fundamental questions, problems, and cases, vol. I
McGraw-Hill , 1965
 Buku Referensi
Jennings, Ivor, Sir, 1903-1965
Constitutional laws of the commonwealth; Vol. 1 : the monarchies
Clarendon Press, 1957
 Buku Teks