Barber, W. E., Came, C. G., Goepp, C., & Blodget, L. (1868). Essays on political organization: Selected from among those submitted in competition for the prizes offered by the Union league of Philadelphia. Philadelphia: Collins, printer.

Barber, W. E., Charles G. Came, Charles Goepp, and Lorin Blodget. Essays On Political Organization: Selected From Among Those Submitted in Competition for the Prizes Offered By the Union League of Philadelphia. Philadelphia: Collins, printer, 1868.

Barber, W. E., Charles G. Came, Charles Goepp, and Lorin Blodget. Essays On Political Organization: Selected From Among Those Submitted in Competition for the Prizes Offered By the Union League of Philadelphia. Philadelphia: Collins, printer, 1868.