APA
Strong C F,, . (1930). Modern political constitutions : An introduction to the comparative study of their history and existing form. London: Sidwick & Jackson Ltd.
Chicago
Strong C F,, . 1930. Modern political constitutions : An introduction to the comparative study of their history and existing form. London: Sidwick & Jackson Ltd.
Harvard
Strong C F,, . (1930). Modern political constitutions : An introduction to the comparative study of their history and existing form. London: Sidwick & Jackson Ltd.
MLA
Strong C F,, . Modern political constitutions : An introduction to the comparative study of their history and existing form. London: Sidwick & Jackson Ltd. 1930.