APA (7th ed.) Citation

Smith, M. U. (1991). Toward a unified theory of problem solving: Views from the content domains. Lawrence Erlbaum.

Chicago Style (17th ed.) Citation

Smith, Mike U. Toward a Unified Theory of Problem Solving: Views from the Content Domains. Hillsdale, New Jersey [etc.]: Lawrence Erlbaum, 1991.

MLA (9th ed.) Citation

Smith, Mike U. Toward a Unified Theory of Problem Solving: Views from the Content Domains. Lawrence Erlbaum, 1991.