@COMMENT { BibTex package created from National Library of Australia Catalogue https://catalogue.nla.gov.au } @Book{ nla.cat-vn1632653, title = { The principles and practice of the chinese abacus /by Lau Chung Him }, edition = { 5th ed. }, publisher = { Lau Chung Him Hong Kong }, pages = { 315 p. : }, year = { 1980 }, type = { Book }, language = { English }, subjects = { Abacus. }, life-dates = { 1980 - }, catalogue-url = { https://nla.gov.au/nla.cat-vn1632653 }, }