Lua APA (7ú heag.)

SINGH, J. A. D. (1984). AGRICULTURAL GEOGRAPHY. McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

SINGH, JASBIR AND DHILLON. AGRICULTURAL GEOGRAPHY. McGraw-Hill, 1984.

Lua MLA (8ú heag.)

SINGH, JASBIR AND DHILLON. AGRICULTURAL GEOGRAPHY. McGraw-Hill, 1984.

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