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Lauren G. Block; Vicki G. Morwitz (1999). “Shopping Lists as an External Memory Aid for Grocery Shopping: Influences on List Writing and List Fulfillment”. Journal of Consumer Psychology. 8 (4): 343–75. CiteSeerX10.1.1.357.9751. doi:10.1207/s15327663jcp0804_01. JSTOR1480440.