Wheare, K. C.
Modern constitutions
Oxford University Press, 1975
 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 & Jackson Limited, 1960
 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