Needles, B. E. (1984). Principles of accounting (2nd ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Needles, Belverd E. Principles of Accounting. 2nd ed. Boston: Houghton Mifflin, 1984.
Lua MLA (9ú heag.)Needles, Belverd E. Principles of Accounting. 2nd ed. Houghton Mifflin, 1984.
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