APPROPRIATIONS, United States Congress House Committee on. Investigation reports and departmental comments. [s.l.]: U.S. Government Printing Office 336 s. Dostupné online. (anglicky) Google-Books-ID: HCjwjTdz06wC.
RESEARCH, University of Maryland, College Park Bureau of Business and Economic. Studies in Business and Economics. [s.l.]: [s.n.] 36 s. Dostupné online. (anglicky) Google-Books-ID: 61fpAAAAMAAJ.