EXHIBIT 99.906CERT CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 ----------------------------------------------------------------------- In connection with the shareholder report of American Century World Mutual Funds, Inc. (the "Registrant") on Form N-CSR for the period ending May 31, 2008 (the "Report"), we, the undersigned, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: (1) The Report fully complies with the requirements of Section 15(d) of the Securities Exchange Act of 1934; and (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Dated: July 30, 2008 /s/ Jonathan S. Thomas ------------------------------------ Jonathan S. Thomas President (chief executive officer) /s/ Robert J. Leach ------------------------------------- Robert J. Leach Vice President, Treasurer, and Chief Financial Officer (chief financial officer)
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N-CSRS Filing
American Century Emerging Markets Investor Class (TWMIX) N-CSRSCertified semi-annual shareholder report (management investment company)
Filed: 4 Aug 08, 12:00am