Lajuhistory, areography, and trophic structure. Lubbock, TX : Museum of Texas Tech University, 2001, p. 6. [1] 5.4 Multi-hazards risk Archyvuota kopija 2021-04-21
Intelektinė nuosavybė England: Oxford University Press, n.d.), 416. Spinello, Richard A. (January 2007). „Intellectual property rights“. Library Hi Tech 25 (1): 12–22. doi:10