Keeney, R. L., & Lilien, G. L. (1978). A Utility Model for Product Positioning. In S. Zionts (Ed.), Multiple criteria problem solving proceedings of a conference, Buffalo, N.Y. (U.S.A.), August 22-26, 1977 (pp. 321–334). Springer.

Keeney, R. L., and G. L. Lilien. “A Utility Model for Product Positioning.” In Multiple Criteria Problem Solving Proceedings of a Conference, Buffalo, N.Y. (U.S.A.), August 22-26, 1977, edited by S. Zionts, 321–34. Springer, 1978.

Keeney RL, Lilien GL. A Utility Model for Product Positioning. In: Zionts S, editor. Multiple criteria problem solving proceedings of a conference, Buffalo, NY (USA), August 22-26, 1977. Springer; 1978. p. 321–34.

Keeney, R. L., and G. L. Lilien. “A Utility Model for Product Positioning.” Multiple Criteria Problem Solving Proceedings of a Conference, Buffalo, N.Y. (U.S.A.), August 22-26, 1977, edited by S. Zionts, Springer, 1978, pp. 321–34.

Keeney RL, Lilien GL. A Utility Model for Product Positioning. In: Zionts S, editor. Multiple criteria problem solving proceedings of a conference, Buffalo, NY (USA), August 22-26, 1977. Springer; 1978. p. 321–334.