Citing Logos books has been easy for the most part, since they represent the digital versions of physical, printed books. I would just use the publication information from the printed book.
Recently, however, Logos has published some titles digitally for which there is not printed version. The "Exposition of Prayer in the Bible" is one such title. Were I to write an academic paper would I need to identify it as an electronic resource, or could I simply cite it as I would a printed book but with Logos Research Systems as the publisher?
Going a step further, there are printed books for which Logos has produced its own version, such as many of Spurgeon's works. For academic purposes, should I track down a physical copy for publisher information, or is it legitimate to use the Logos citation (Logos Research Systems, or Ages Software, as publisher)?
Thank you in advance for your thoughts.