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An informal introduction to stochastic calculus with applications
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ON WRITING WELL AN INFORMAL GUIDE TO WRITING NONFICTION
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AFRICAN CONFLICTS AND INFORMAL POWER BIG MEN AND NETWORKS
MATS UTAS2012 年出版256 页ISBN：1848138822
民间融资法律规制问题研究=Research on the regulation of informal financing
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Cases on Formal and Informal E-Learning Environments:Opportunities and Practices
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CALCULUS CONCEPTS:AN INFORMAL APPROACH TO THE MATHEMATICS OF CHANGE FIRST EDITION
DONALD R.LATORRE JOHN W.KENELLY IRIS B.FETTA1998 年出版699 页ISBN：0669451250
ORGANIZING WOMEN WORKERS IN THE INFORMAL ECONOMY BEYOND THE WEAPONS OF THE WEAK
NAILA KABEER2013 年出版299 页ISBN：1780324524
The Silent revolution : the informal sector in five Asian and Near Eastern countries
edited by A. Lawrence Chickering and Mohamed Salahdine.1991 年出版246 页ISBN：
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