Παραπομπή σε μορφή APA (7η εκδ.)

Hristova, S. G. (2009). Qualitative investigations and approximate methods for impulsive equations. Nova Science Publishers, Inc..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hristova, Snezhana G. Qualitative Investigations and Approximate Methods for Impulsive Equations. New York: Nova Science Publishers, Inc., 2009.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hristova, Snezhana G. Qualitative Investigations and Approximate Methods for Impulsive Equations. Nova Science Publishers, Inc., 2009.