Nygren, Viveka Blom. 30-minute yoga : for better balance and strength in your life / Thirty minute yoga Viveka Blom Nygren. - New York : Skyhorse Pub., c2011. - 64 p. : col. ill. ; 25 cm. ISBN: 9781616080648 (hardcover : alk. paper) LCCN: 2010033651 Subjects--Topical Terms: Aṣṭāṅga yoga. LC Class. No.: RA781.68 / .N94 2011 Dewey Class. No.: 613.7/046