Petersen, W. J. (1667). Another hand on mine: The story of Dr. Carl K. Becker of the Africa Inland Mission ([1st ed.].). McGraw-Hill.

Petersen, William J. Another Hand on Mine: The Story of Dr. Carl K. Becker of the Africa Inland Mission. [1st ed.]. New York: McGraw-Hill, 1667.

Petersen, William J. Another Hand on Mine: The Story of Dr. Carl K. Becker of the Africa Inland Mission. [1st ed.]. McGraw-Hill, 1667.