International symposium on numerical analysis :Polytechnic University of Madrid, Espagne, & Ortiz, E. L. (1987). Numerical approximation of partial differential equations: Selection of papers presented at the International Symposium on Numerical Analysis, held at the Polytechnic University of Madrid, September 17-19, 1985. North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International symposium on numerical analysis :Polytechnic University of Madrid, Espagne, و Eduardo L. Ortiz. Numerical Approximation of Partial Differential Equations: Selection of Papers Presented at the International Symposium on Numerical Analysis, Held at the Polytechnic University of Madrid, September 17-19, 1985. Amsterdam ; New York ; Oxford [etc.] : New York, N.Y., U.S.A.: North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co, 1987.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International symposium on numerical analysis :Polytechnic University of Madrid, Espagne, و Eduardo L. Ortiz. Numerical Approximation of Partial Differential Equations: Selection of Papers Presented at the International Symposium on Numerical Analysis, Held at the Polytechnic University of Madrid, September 17-19, 1985. North-Holland ; Sole distributors for the U.S.A. and Canada, Elsevier Science Pub. Co, 1987.