APA
Koren H. J., . (1957). An introduction to the science of metaphysics. London: B. Herder Book Co.
Chicago
Koren Henry J, . 1957. An introduction to the science of metaphysics. London: B. Herder Book Co.
Harvard
Koren H. J., . (1957). An introduction to the science of metaphysics. London: B. Herder Book Co.
MLA
Koren Henry J, . An introduction to the science of metaphysics. London: B. Herder Book Co. 1957.
