Gaya APA

Swanson, C, P., Wan, F, Y. (NULL). Introduction to the calculus of variations and its applications . New: New York: Chapman & Hall; 1995.

Gaya MLA

Swanson, Carl, P.., Wan, Frederick, Y.M.. "Introduction to the calculus of variations and its applications". New: New York: Chapman & Hall; 1995, NULL. Text.