Callaway, H. G. (2014). Arthur S. Eddington: The nature of the physical world : Gifford lectures of 1927 (Annotated edition.). Cambridge Scholars Publishing.

Callaway, H. G. Arthur S. Eddington: The Nature of the Physical World : Gifford Lectures of 1927. Annotated edition. Newcastle upon Tyne, England: Cambridge Scholars Publishing, 2014.

Callaway, H. G. Arthur S. Eddington: The Nature of the Physical World : Gifford Lectures of 1927. Annotated edition. Cambridge Scholars Publishing, 2014.