Spell, R. V. (1956). Public liability hazards: A discussion of the legal liability that may arise from various activities which, for the protection of those both directly and indirectly concerned, should be covered by insurance (Third edition.). Rough Notes Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Spell, Reginald V. Public Liability Hazards: A Discussion of the Legal Liability That May Arise from Various Activities Which, for the Protection of Those Both Directly and Indirectly Concerned, Should Be Covered by Insurance. Third edition. Indianapolis: Rough Notes Co., 1956.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Spell, Reginald V. Public Liability Hazards: A Discussion of the Legal Liability That May Arise from Various Activities Which, for the Protection of Those Both Directly and Indirectly Concerned, Should Be Covered by Insurance. Third edition. Rough Notes Co., 1956.