Gaya APA

BOYCE, W, E., DIPRIMA, R, C. (1997). Elementary differential equations and boundary value problems (6th ed.). New York: John Willey & Sons.

Gaya MLA

BOYCE, William, E.., DIPRIMA, Richard, C.. "Elementary differential equations and boundary value problems". 6th ed. New York: John Willey & Sons, 1997. Buku.