Cohen, W. M., & Levin, R. (1989). Empirical Studies of Innovation and Market Structure. In R. Schmalensee & R. Willig (Eds.), The Handbook of Industrial Organization (pp. 1060–1107). North Holland.

Cohen, W. M., and R. Levin. “Empirical Studies of Innovation and Market Structure.” In The Handbook of Industrial Organization, edited by R. Schmalensee and R. Willig, 1060–1107. North Holland, 1989.

Cohen WM, Levin R. Empirical Studies of Innovation and Market Structure. In: Schmalensee R, Willig R, editors. The Handbook of Industrial Organization. North Holland; 1989. p. 1060–107.

Cohen, W. M., and R. Levin. “Empirical Studies of Innovation and Market Structure.” The Handbook of Industrial Organization, edited by R. Schmalensee and R. Willig, North Holland, 1989, pp. 1060–107.

Cohen WM, Levin R. Empirical Studies of Innovation and Market Structure. In: Schmalensee R, Willig R, editors. The Handbook of Industrial Organization. North Holland; 1989. p. 1060–1107.