Hollingsworth, D. (1954). Rocks in the roadway; a treatise on police public relations, by a police officer, for police officers. s.n.
Παραπομπή σε μορφή Chicago (17η εκδ.)Hollingsworth, Dan. Rocks in the Roadway; a Treatise on Police Public Relations, by a Police Officer, for Police Officers. Chicago: s.n, 1954.
Παραπομπή σε μορφή MLA (9th εκδ.)Hollingsworth, Dan. Rocks in the Roadway; a Treatise on Police Public Relations, by a Police Officer, for Police Officers. s.n, 1954.
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