Keller, H. R. e. (1929). The reader's digest of books (New and greatly enl. ed.). Macmillan company.
Lua i Stíl Chicago (17ú heag.)Keller, Helen Rex ed. The Reader's Digest of Books. New and greatly enl. ed. New York: Macmillan company, 1929.
Lua MLA (9ú heag.)Keller, Helen Rex ed. The Reader's Digest of Books. New and greatly enl. ed. Macmillan company, 1929.
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