Up de Graff, F. W. d. 1. (1923). Head-hunters of the Amazon: Seven years of exploration and adventure. Herbert Jenkins.
Citazione stile Chigago Style (17a edizione)Up de Graff, F. W. d. 1927. Head-hunters of the Amazon: Seven Years of Exploration and Adventure. London: Herbert Jenkins, 1923.
Citatione MLA (8a ed.)Up de Graff, F. W. d. 1927. Head-hunters of the Amazon: Seven Years of Exploration and Adventure. Herbert Jenkins, 1923.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.