Walle, P. (1914). Bolivia: Its people and its resources its railways, mines, and rubber forest. T. Fisher Unwin.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Walle, Paul. Bolivia: Its People and Its Resources Its Railways, Mines, and Rubber Forest. London, England, United Kingdom: T. Fisher Unwin, 1914.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Walle, Paul. Bolivia: Its People and Its Resources Its Railways, Mines, and Rubber Forest. T. Fisher Unwin, 1914.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.