Perrier, E. (1925). The earth before history: Man's origin and the origin of life. Kegan Paul, Trench, Trubner.
Citazione stile Chigago Style (17a edizione)Perrier, Edmond. The Earth Before History: Man's Origin and the Origin of Life. Lond: Kegan Paul, Trench, Trubner, 1925.
Citatione MLA (8a ed.)Perrier, Edmond. The Earth Before History: Man's Origin and the Origin of Life. Kegan Paul, Trench, Trubner, 1925.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.