McKaig, K., Caro, F. G., & Smith, M. J. (1986). Beyond the threshold: Families caring for their children who have significant developmental disabilities. Community Service Society of New York : Copies may be ordered from Office of Information, Community Service Society.

McKaig, Kathleen, Francis G. Caro, and Michael J. Smith. Beyond the Threshold: Families Caring for Their Children Who Have Significant Developmental Disabilities. New York, NY: Community Service Society of New York : Copies may be ordered from Office of Information, Community Service Society, 1986.

McKaig, Kathleen, et al. Beyond the Threshold: Families Caring for Their Children Who Have Significant Developmental Disabilities. Community Service Society of New York : Copies may be ordered from Office of Information, Community Service Society, 1986.