Loomis, R. A. (1915). Progressive exercises in typography: A text for the school print shop and the apprentice printer. The Taylor-Holden company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Loomis, Ralph Andrews. Progressive Exercises in Typography: A Text for the School Print Shop and the Apprentice Printer. Springfield, Mass.: The Taylor-Holden company, 1915.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Loomis, Ralph Andrews. Progressive Exercises in Typography: A Text for the School Print Shop and the Apprentice Printer. The Taylor-Holden company, 1915.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.