RAJ DES. (1999). SAMPLE SURVEY THEORY. NAROSA PUBLISHING HOUSE.
Lua i Stíl Chicago (17ú heag.)RAJ DES. SAMPLE SURVEY THEORY. NEW DELHI: NAROSA PUBLISHING HOUSE, 1999.
Lua MLA (9ú heag.)RAJ DES. SAMPLE SURVEY THEORY. NAROSA PUBLISHING HOUSE, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.