Pollio, D. E., North, C. S., Eyrich, K. M., Foster, D. A., & Spitznagel, E. L. (2006). A comparison of agency‐based and self‐report methods of measuring services across an urban environment by a drug‐abusing homeless population. Int J Methods Psychiatr Res.

Pollio, David E., Carol S. North, Karin M. Eyrich, Douglas A. Foster, and Edward L. Spitznagel. "A Comparison of Agency‐based and Self‐report Methods of Measuring Services Across an Urban Environment By a Drug‐abusing Homeless Population." Int J Methods Psychiatr Res 2006.

Pollio, David E., et al. "A Comparison of Agency‐based and Self‐report Methods of Measuring Services Across an Urban Environment By a Drug‐abusing Homeless Population." Int J Methods Psychiatr Res 2006.