Ringold, P. L. (1980). The coastal almanac for 1980 - The year of the coast. W. H. Freeman.
Lua i Stíl Chicago (17ú heag.)Ringold, Paul L. The Coastal Almanac for 1980 - The Year of the Coast. San Francisco: W. H. Freeman, 1980.
Lua MLA (9ú heag.)Ringold, Paul L. The Coastal Almanac for 1980 - The Year of the Coast. W. H. Freeman, 1980.
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