Citazione Stile APA (7a Edizione)

Walle, P. (1914). Bolivia: Its people and its resources its railways, mines, and rubber forest. T. Fisher Unwin.

Citazione stile Chigago Style (17a edizione)

Walle, Paul. Bolivia: Its People and Its Resources Its Railways, Mines, and Rubber Forest. London, England, United Kingdom: T. Fisher Unwin, 1914.

Citatione MLA (9a ed.)

Walle, Paul. Bolivia: Its People and Its Resources Its Railways, Mines, and Rubber Forest. T. Fisher Unwin, 1914.