Tohutoro APA (7th ed.)
(1988). Ostfriesland. Hoffmann u. Campe.
Tohutoru Kātū Chicago (17th ed.)
Ostfriesland. Hamburg: Hoffmann u. Campe, 1988.
Tohutoro MLA (9th ed.)
Ostfriesland. Hoffmann u. Campe, 1988.
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