APA
(1981). World book complete word power library- 2 vol. Chicago: World book- childcraft international.
Chicago
1981. World book complete word power library- 2 vol. Chicago: World book- childcraft international.
Harvard
(1981). World book complete word power library- 2 vol. Chicago: World book- childcraft international.
MLA
World book complete word power library- 2 vol. Chicago: World book- childcraft international. 1981.