APA (7th ed.) Citation

Phillips, O. M. (1968). The heart of the Earth / by O.M. Phillips. Freman, Cooper and Co.

Chicago Style (17th ed.) Citation

Phillips, O. M. The Heart of the Earth / by O.M. Phillips. Freman, Cooper and Co, 1968.

MLA (9th ed.) Citation

Phillips, O. M. The Heart of the Earth / by O.M. Phillips. Freman, Cooper and Co, 1968.

Warning: These citations may not always be 100% accurate.