Fisher, L. A., Johnson, T. S., Porter, D., Bleich, H. L., & Slack, W. V. (1977). Collection of a clean voided urine specimen: A comparison among spoken, written, and computer-based instructions.

Fisher, L A., T S. Johnson, D. Porter, H L. Bleich, und W V. Slack. Collection of a Clean Voided Urine Specimen: A Comparison Among Spoken, Written, and Computer-based Instructions. 1977.

Fisher, L A., et al. Collection of a Clean Voided Urine Specimen: A Comparison Among Spoken, Written, and Computer-based Instructions. 1977.