Ludlum, R. (2003). The Altman code: A covert one novel : Serie created by Robert Ludlum, written by Gayle Lynds. St. Martin`s Griffin.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ludlum, Robert. The Altman Code: A Covert One Novel : Serie Created by Robert Ludlum, Written by Gayle Lynds. St. Martin`s Griffin, 2003.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Ludlum, Robert. The Altman Code: A Covert One Novel : Serie Created by Robert Ludlum, Written by Gayle Lynds. St. Martin`s Griffin, 2003.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.