Sturton, M. (1992). Tonga: Development through agricultural exports. Pacific Islands Development Program, East-West Center.
Lua i Stíl Chicago (17ú heag.)Sturton, Mark. Tonga: Development Through Agricultural Exports. Honolulu, Hawaii: Pacific Islands Development Program, East-West Center, 1992.
Lua MLA (8ú heag.)Sturton, Mark. Tonga: Development Through Agricultural Exports. Pacific Islands Development Program, East-West Center, 1992.
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