Text ( visual ) : unmediated Urban informal sector : a critical review / Tirthankar Roy, Rakesh Basant. -- Ahmedabad : Gujarat Institute of Area Planning , 1990. -- 27 p. ; 29 cm. -- (Working paper series ; . Working paper ; no. 27). -- Includes bibliographical references (p. 25-27). -- (BB06462167) ; https://ci.nii.ac.jp/ncid/BB06462167 Author Heading(s): Roy, Tirthankar ; Basant, Rakesh. -- Subject Heading(s): LCSH : Informal sector (Economics) -- India