International Conference on the History of Alchemy University of Groningen & Martels, Z. R. W. M. v. (1990). Alchemy revisited: Proceedings of the International Conference on the History of Alchemy at the University of Groningen, 17-19 April 1989. E.J. Brill.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Conference on the History of Alchemy University of Groningen و Z. R. W. M. von Martels. Alchemy Revisited: Proceedings of the International Conference on the History of Alchemy at the University of Groningen, 17-19 April 1989. Leiden ; New York: E.J. Brill, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Conference on the History of Alchemy University of Groningen و Z. R. W. M. von Martels. Alchemy Revisited: Proceedings of the International Conference on the History of Alchemy at the University of Groningen, 17-19 April 1989. E.J. Brill, 1990.