Παραπομπή σε μορφή APA (7η εκδ.)

Heikkila, S., & Lakshmikantham, V. (1994). Monotone iterative techniques for discontinuous non-linear differential equations. Marcel Dekker.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Heikkila, Seppo, και V. Lakshmikantham. Monotone Iterative Techniques for Discontinuous Non-linear Differential Equations. New York: Marcel Dekker, 1994.

Παραπομπή σε μορφή MLA (9th εκδ.)

Heikkila, Seppo, και V. Lakshmikantham. Monotone Iterative Techniques for Discontinuous Non-linear Differential Equations. Marcel Dekker, 1994.