publisher: National Geographic Society publish date: February 13th 2013
format: paperback pages: 176
ISBN:
1133315682 (9781133315681)
publisher: Cengage Learning, Hardcover" /> publish date: January 1st 2012
format: hardcover
ISBN:
113356447X (9781133564478)
ISBN:
0435240366 (9780435240363)
publisher: Cengage Learning Emea publish date: April 1st 2013
format: paperback
ISBN:
1408068141 (9781408068144)