Berk, U. (1979). Konstruktive Argumentationstheorie Problemata.
Chicago Style (17th ed.) CitationBerk, Ulrich. "Konstruktive Argumentationstheorie." Problemata 1979.
MLA (8th ed.) CitationBerk, Ulrich. "Konstruktive Argumentationstheorie." Problemata, 1979.
Warning: These citations may not always be 100% accurate.