APA

Guthrie W. K. C., . (1950). The Greek philosophers from Thales to Aristotle. New York: Harper & Row.

Chicago

Guthrie W K C, . 1950. The Greek philosophers from Thales to Aristotle. New York: Harper & Row.

Harvard

Guthrie W. K. C., . (1950). The Greek philosophers from Thales to Aristotle. New York: Harper & Row.

MLA

Guthrie W K C, . The Greek philosophers from Thales to Aristotle. New York: Harper & Row. 1950.