Werner, Carol M.; Stoll, Robert; Birch, Paul; White, Paul H. (2002). Clinical Validation and Cognitive Elaboration: Signs That Encourage Sustained Recycling. Basic and Applied Social Psychology, 24, 3, 185 – 203.

Bator, R. J. (1997). Effective public service announcements: Linking social norms to visual memory cues. Dissertation Abstracts International: Section B: The Sciences and Engineering, 58, 6-B,

Littlejohn, C. R. (1997). Measuring the effects of message framing on the behavior of recycling in a residential recycling program. Dissertation Abstracts International Section A: Humanities and Social Sciences, 58, 3-A,

Reiter, S. M. & Samuel, W. (1980). Littering as a function of prior litter and the presence or absence of prohibitive signs . Journal of Applied Social Psychology, 10, 1, 45-55.

Lord, K. R. (1994). Motivating recycling behavior: A quasiexperimental investigation of message and source strategies. Special Issue: Psychology, marketing, and recycling. Psychology and Marketing, 11, 4, 341-358.

Werner, C. M., Rhodes, M.U. & Partain, K. K. (1998). Designing effective instructional signs with schema theory: Case studies of polystyrene recycling. Environment and Behavior, 30, 5, 709-735.

Mio, J. S., Thompson, S. C., & Givens, G. H. (1993). The commons dilemma as metaphor: Memory, influence, and implications for environmental conservation. Metaphor and Symbolic Activity, 8, 1, 23-42.

Horsley, A. D. (1988). The unintended effects of a posted sign on littering attitudes and stated intentions. Journal of Environmental Education, 19, 3, 10-14.

Obermiller, C. (1995). The baby is sick/the baby is well: A test of environmental communication appeals. Special Issue: Green advertising. Journal of Advertising, 24, 2, 55-70.

Reich, J. W., & Robertson, J. L. (1979). Reactance and norm appeal in anti-littering messages. Journal of Applied Social Psychology, 9, 1, 91-101.