Casley, D. J. Data collection in developing countries D. J. Casley and D. A. Lury - 2nd ed. - Oxford Clarendon Press 1987 - 225 p. : ill. ; 25 cm. ISBN: 0198772823 LCCN: 87-012574 Subjects--Topical Terms: Sampling (Statistics) Subjects--Geographic Terms: Developing countries--Statistical services