APA

Hoople R. E., Piper R. F. & Tolley W. P. (1946). Preface to philosophy: book of readings. New York: The Macmillan company.

Chicago

Hoople Ross Earle, Piper Raymond Frank and Tolley William Pearson. 1946. Preface to philosophy: book of readings. New York: The Macmillan company.

Harvard

Hoople R. E., Piper R. F. and Tolley W. P. (1946). Preface to philosophy: book of readings. New York: The Macmillan company.

MLA

Hoople Ross Earle, Piper Raymond Frank and Tolley William Pearson. Preface to philosophy: book of readings. New York: The Macmillan company. 1946.