Pitard, Francis F. Pierre Gy's Sampling Theory and Sampling Practice: Vol. II: Sampling Correctness and Sampling Practice / Francis F. Pitard. - Boca Raton ; Florida : CRC Press, 1989. - 247 p. - 622'.7 . Index: p. 241-247 ISBN: 0-8493-6659-3 Subjects--Topical Terms: Ores-Sampling and estimation Dewey Class. No.: 622'.7