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Worchel, Stephen, Frances Ferris Gary Samaha, Danny Axsom, and Susan Schweizer. 1978. “Determinants of the Effect of Intergroup Cooperation on Intergroup Attraction.”. Journal of Conflict Resolution 22: 428-39. doi:10.1177/002200277802200304. Reference Link
Worchel, Stephen, and Nancy Norvell. 1980. “Effect of Perceived Environmental Conditions During Cooperation on Intergroup Attraction”. Journal of Personality & Social Psychology 38: 764-72. doi:10.1037/0022-3514.38.5.764. Reference Link