APA
Maritain J., Watkin E. I., . (1930). An introduction to philosophy. London: Sheed and Ward.
Chicago
Maritain Jacques, Watkin E I, . 1930. An introduction to philosophy. London: Sheed and Ward.
Harvard
Maritain J., Watkin E. I., . (1930). An introduction to philosophy. London: Sheed and Ward.
MLA
Maritain Jacques, Watkin E I, . An introduction to philosophy. London: Sheed and Ward. 1930.
