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Laughlin, P. (2011-02-13). Letters-to-Numbers Problems. In Group Problem Solving. : Princeton University Press. Retrieved 5 Jul. 2022, from https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691147918.001.0001/upso-9780691147918-chapter-6.
Laughlin, Patrick R. "Letters-to-Numbers Problems." Group Problem Solving. : Princeton University Press,
19. Princeton Scholarship Online. Date Accessed 5 Jul. 2022 <https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691147918.001.0001/upso-9780691147918-chapter-6>.
Laughlin, Patrick R. "Letters-to-Numbers Problems." In Group Problem Solving. Princeton University Press, 2011. Princeton Scholarship Online, 2017. doi: 10.23943/princeton/9780691147918.003.0006.
Laughlin PR. Letters-to-Numbers Problems. In: Group Problem Solving. Princeton University Press; 2011. https://princeton.universitypressscholarship.com/view/10.23943/princeton/9780691147918.001.0001/upso-9780691147918-chapter-6. Accessed July 5, 2022.