Citation: Mm. Robbins, WHO CREATED SANTA (NAST,THOMAS CARTOONS FOR HARPERS-WEEKLY IN THE LATTER PART OF THE 19TH-CENTURY), The New York times book review, 1998, pp. 4-4
Citation: Mm. Robbins et Nm. Czekala, A PRELIMINARY INVESTIGATION OF URINARY TESTOSTERONE AND CORTISOL-LEVELS IN WILD MALE MOUNTAIN GORILLAS, American journal of primatology, 43(1), 1997, pp. 51-64