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- Freitag, P. and Engel, M. B., Microscopic Demonstration of Autonomic Innervations in Rabbit Salivary Glands, M. S. Thesis, University of Illinois, October 1968.
- Freitag, P. and Engel, M. B., Microscopic Demonstration of Autonomic Innervation in Rabbit Salivary Glands, J. Dent Research 48: Supplement, Abstract 87, 1969.
- Freitag, P. and Engel, M. B., Innervation in Rabbit Salivary Glands, Anat. Rec. 167: 87 - 106, 1970.
- Freitag, P. and Engel, M. B. and Svihla G., Ultraviolet Micrography and Histochemistry of Rat Salivary Glands, J. Dent, Research 50: Supplement, Abstract 628, 1971.
- Freitag, P., Influences of Some Neuropharmacological Agents on Acini Of Rat Salivary Glands, Ph.D. Thesis, University of Illinois, August 1970.
- Freitag, P. and Engel, M. B., Interference Microscopy of Rat Salivary Glands, J. Dent, Research 50: Supplement, Abstract 629, 1971.
- Freitag, P. and Engel, M. B. and Svihla G., Cryostat Cut, Freeze-Dried Tissues for Microscopic Investigations, Microscope 19: 271-279, 1971.
- Freitag, P. and S. Hirasuna and Milgram J., Double Dislocation of a Finger, The Physician and Sports Medicine 5: October, 1979.
- Freitag, P. and Head, J. R. Jr. and Lim, H. M., Radioulnar Synostosis Following Trauma, Review of Literature and Report of Case, Presented in the annual meeting of the American Association of Hand Surgery on September 26, 1980 in New Orleans, Louisiana.
- Freitag, P., Back-pain sufferers can avoid stooping to major surgery. Chicago Tribune, Tempo section, page 9, November 1, 1987
- Levy, J., Freitag, P., Bauer, Raj, R.K., Karkazis, G., "Spontaneous" Lumbar Subdural Hematoma, American Journal of Neuroradiology ll: 780-781, July/August, 1990.
- Freitag, P. L5-S1 Made Easy - Go Looking For The Old Chymodiactin Ruler. Poster Presentation, Eighth Annual Intradiscal Therapy Society Meeting, March 15-19, 1995, La Jolla, California.
- Curtis R, Freitag P, Laguardia, J. Thornton S, Vicari S, Markwell S. Spinal Cord Compromise: An Important but Underdiagnosed Condition in People with Mental Retardation. Public Health Reports Vol. 119 (4) : 396-400, July-August 2004
- Richardson, TD, SJ Pineda, KB Strenge, TA Van Fleet, M MacGregor, JC Milbrandt, JA Espinosa, P Freitag. Serum Titanium Levels after Instrumented Spinal Arthrodesis. Spine 33(7):792-6. 2008
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