Barela, A. R. d. (1955). Industrial legislation in United States - Caribbean area, Commonwealth of Puerto Rico and the Virgin Islands. Office of Industrial, Labor and Public Relations.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Barela, Adelaide Romero de. Industrial Legislation in United States - Caribbean Area, Commonwealth of Puerto Rico and the Virgin Islands. San Juan, P.R.: Office of Industrial, Labor and Public Relations, 1955.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Barela, Adelaide Romero de. Industrial Legislation in United States - Caribbean Area, Commonwealth of Puerto Rico and the Virgin Islands. Office of Industrial, Labor and Public Relations, 1955.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.