Cohen, W. M. (1995). Empirical Studies of Innovative Activity. In P. Stoneman (Ed.), Handbook of the  Economics of Innovation and Technical Change. Oxford: Basil Blackwell.

Cohen, W. M. “Empirical Studies of Innovative Activity.” In Handbook of the  Economics of Innovation and Technical Change, edited by P. Stoneman. Oxford: Basil Blackwell, 1995.

Cohen WM. Empirical Studies of Innovative Activity. In: Stoneman P, editor. Handbook of the  Economics of Innovation and Technical Change. Oxford: Basil Blackwell; 1995.

Cohen, W. M. “Empirical Studies of Innovative Activity.” Handbook of the  Economics of Innovation and Technical Change, edited by P. Stoneman, Basil Blackwell, 1995.

Cohen WM. Empirical Studies of Innovative Activity. In: Stoneman P, editor. Handbook of the  Economics of Innovation and Technical Change. Oxford: Basil Blackwell; 1995.