APA

Watkin E. I., . (1920). The philosophy of mysticism. London: Gran Rapids.

Chicago

Watkin Edward Ingram, . 1920. The philosophy of mysticism. London: Gran Rapids.

Harvard

Watkin E. I., . (1920). The philosophy of mysticism. London: Gran Rapids.

MLA

Watkin Edward Ingram, . The philosophy of mysticism. London: Gran Rapids. 1920.