Upon the lines already laid down, the main-entry becomes

Ely, Richard T., and George Ray Wicker.
Elementary principles of economics; together
with a short sketch of economic history. New
York, Macmillan Co., 1910. pp. xii., 388

Frequently the names of the authors are seen rendered in this fashion

Ely, Richard T., and Wicker, George Ray

While it is essential and unavoidable that the name of the first author should be turned about to get his surname as the leading word, yet there is no object in twisting about the second author's name in like manner, as it is not so required, therefore the ordinary reading of the name is better and simpler, as given in the first entry.

Unless needed to distinguish between different authors of the same name, the academical degrees are omitted, as well as any statement concerning the professorships held by these authors, although the fact that they hold such offices goes to prove their qualifications for dealing with this subject. If it were desired to direct attention to this, it could be done by means of a note or annotation to the entry, after this manner

The first author is Prof. of Pol. Econ., Wisconsin Univ., and the second Asst. Prof. of Economics, Dartmouth Coll.

The share of the second author in the book needs to be recognised, and this is accomplished by means of a reference, as

Wicker, George Ray (Joint-Author.) See Ely,
Richard T.