Ferriss, T., & Porter, R. (2009). The 4-hour workweek: Escape 9-5, live anywhere, and join the new rich (Unabridged, Updated.). Blackstone Audio, Inc., and Buck 50 Productions, LLC.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ferriss, Timothy, و Ray Porter. The 4-hour Workweek: Escape 9-5, Live Anywhere, and Join the New Rich. Unabridged, Updated. Ashland: Blackstone Audio, Inc., and Buck 50 Productions, LLC, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ferriss, Timothy, و Ray Porter. The 4-hour Workweek: Escape 9-5, Live Anywhere, and Join the New Rich. Unabridged, Updated. Blackstone Audio, Inc., and Buck 50 Productions, LLC, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.