Stewart, P. (1963). Meteorology unit. Encyclopaedia Britannica Educational Corporation.
Lua i Stíl Chicago (17ú heag.)Stewart, P.E. Meteorology Unit. Chicago: Encyclopaedia Britannica Educational Corporation, 1963.
Lua MLA (9ú heag.)Stewart, P.E. Meteorology Unit. Encyclopaedia Britannica Educational Corporation, 1963.
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