Rektorys, K. (1980). Variational methods in mathematics, science, and engineering (2nd ed.). D. Reidel Pub. Co..
芝加哥风格引文Rektorys, Karel. Variational Methods in Mathematics, Science, and Engineering. 2nd ed. Dordrecht, Holland ; Boston, U.S.A.: D. Reidel Pub. Co., 1980.
MLA引文Rektorys, Karel. Variational Methods in Mathematics, Science, and Engineering. 2nd ed. D. Reidel Pub. Co., 1980.
警告：这些引文格式不一定是100％准确.