Donauer, F., & Cooper, F. T. (1931). The long defence. Longmans, Green and Co..
Lua i Stíl Chicago (17ú heag.)Donauer, Friedrich, agus Frederic Taber Cooper. The Long Defence. New York, Toronto: Longmans, Green and Co., 1931.
Lua MLA (8ú heag.)Donauer, Friedrich, agus Frederic Taber Cooper. The Long Defence. Longmans, Green and Co., 1931.
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