Peiris, N., & Attanayake, B. M. (2006). Secondary social studies: Incorporating Sri Lankan history, geography and civics. IBH - Internat. Book House.
Citazione stile Chigago Style (17a edizione)Peiris, Newton, e B. M. Attanayake. Secondary Social Studies: Incorporating Sri Lankan History, Geography and Civics. Kurunegala: IBH - Internat. Book House, 2006.
Citatione MLA (9a ed.)Peiris, Newton, e B. M. Attanayake. Secondary Social Studies: Incorporating Sri Lankan History, Geography and Civics. IBH - Internat. Book House, 2006.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.