Butterfield, N., Arthur, M., & Sigafoos, J. (1995). Partners in everyday communicative exchanges: A guide to promoting interaction involving people with severe intellectual disability. Paul H. Brookes Pub.
Čikaški stil citiranja (17. izdanje)Butterfield, Nancy, Michael Arthur, i Jeff Sigafoos. Partners in Everyday Communicative Exchanges: A Guide to Promoting Interaction Involving People with Severe Intellectual Disability. Baltimore: Paul H. Brookes Pub, 1995.
MLA način citiranja (9. izdanje)Butterfield, Nancy, et al. Partners in Everyday Communicative Exchanges: A Guide to Promoting Interaction Involving People with Severe Intellectual Disability. Paul H. Brookes Pub, 1995.
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