APA
Radhakrishnan S., . (1912). Essentials of psychology. London: Oxford University Press.
Chicago
Radhakrishnan S, . 1912. Essentials of psychology. London: Oxford University Press.
Harvard
Radhakrishnan S., . (1912). Essentials of psychology. London: Oxford University Press.
MLA
Radhakrishnan S, . Essentials of psychology. London: Oxford University Press. 1912.