Moore, Russell F.
Modern constitutions
Littlefield, Adams, 1957
 Buku Teks
Hawgood, John A.
Modern constitutions: Since 1787
Macmillan & Co. Limited, 1939
 Buku Teks
Hawgood, John A.
Modern constitutions since 1787/John A. Hawgood
Macmillan and co., limited, 1939
 Buku Teks
Strong, C.F.
Modern political constitutions an introduction to the comparative study of their history and existing forms
Sidgwick and Jackson, 1972
 Buku Teks
Strong, C.F.
Modern political constitutions: an introduction to the comparative study of their history and existing forms
Sidgwick & Jackson Limited, 1960
 Buku Teks