Christiansen, Sofus. “Peter Haggett: Geography - A Global Synthesis. Pearson Education, Harlow, 2001. XXI 833 s., Ill. 27 Cm. Pris Ej wpi^i”. Geografisk Tidsskrift - Danish Journal of Geography, vol. 101, Jan. 2001, https://tidsskrift.dk/geografisktidsskrift/article/view/42427.