Text ( visual ) : unmediated Principles of legal research / Kent C. Olson, Aaron S. Kirschenfeld, Ingrid Mattson. -- 3rd ed. -- St. Paul, Minn. : West Academic , c2020. -- xviii, 562 p. : ill., map ; 24 cm. -- (Concise hornbook series). -- Includes indexes. -- ISBN 9781640208056 ; (BC08764776) ; https://ci.nii.ac.jp/ncid/BC08764776 Other Title(s): Legal research. -- Author Heading(s): Olson, Kent C. ; Kirschenfeld, Aaron S. ; Mattson, Ingrid. -- Subject Heading(s): LCSH : Legal research -- United States