APA
Cronin A., . (1941). The keys of the kingdom. Boston: Little, Brown and Company.
Chicago
Cronin A.J, . 1941. The keys of the kingdom. Boston: Little, Brown and Company.
Harvard
Cronin A., . (1941). The keys of the kingdom. Boston: Little, Brown and Company.
MLA
Cronin A.J, . The keys of the kingdom. Boston: Little, Brown and Company. 1941.
