1. Beccari, Odoardo. 1904. Wanderings in the great forests of Borneo: travels and researches of a naturalist in Sarawak. London: Constable and Co.
2. Berlyne, Daniel E. 1977. Psychological aesthetics. In Handbook of cross-cultural psychology, eds. Harry C. Triandis, and William Wilson Lambert, vol. 3, 323–361. Boston: Allyn Bacon.
3. Bock, Carl. 1882. The head-hunters of Borneo: a narrative of travel up the Mahakkam and down the Barito, also journeyings in Sumatra. London: S. Low, Marton, Searle and Rivington.
4. Chon Kye-Sung. 1989. Understanding recreational traveler’s motivation, attitude and satisfaction. Tourist Review 44(1):3–7.
5. Cook, Oscar. 1924. Borneo: the stealer of hearts. London: Hurst & Blackett.