Tompkins, P. (1981). The magic of obelisks (First edition.). Harper & Row, Publishers.
Lua i Stíl Chicago (17ú heag.)Tompkins, Peter. The Magic of Obelisks. First edition. New York: Harper & Row, Publishers, 1981.
Lua MLA (9ú heag.)Tompkins, Peter. The Magic of Obelisks. First edition. Harper & Row, Publishers, 1981.
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