Lapp, R. E., & Editors, t. (1963). Matter. Time-Life.
Lua i Stíl Chicago (17ú heag.)Lapp, Ralph E., agus the Editors. Matter. New York: Time-Life, 1963.
Lua MLA (9ú heag.)Lapp, Ralph E., agus the Editors. Matter. Time-Life, 1963.
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