APA
Johnson H. G. (., Madrid Conference on optimum currency Areas (1970: Madrid) & Swoboda A. K. (. (1973). The economics of common currencies. London: George Allen and Unwin.
Chicago
Johnson Harry G (Ed.), Madrid Conference on optimum currency Areas (1970: Madrid) and Swoboda Alexander K (Ed.). 1973. The economics of common currencies. London: George Allen and Unwin.
Harvard
Johnson H. G. (., Madrid Conference on optimum currency Areas (1970: Madrid) and Swoboda A. K. (. (1973). The economics of common currencies. London: George Allen and Unwin.
MLA
Johnson Harry G (Ed.), Madrid Conference on optimum currency Areas (1970: Madrid) and Swoboda Alexander K (Ed.). The economics of common currencies. London: George Allen and Unwin. 1973.