Zhechev, V., Stanimirov, E. Loyalty Programs - Specifics, Types, and Benefits for Market Players. Махачкала: Изд. дом Наука плюс, 2013 с. 28 - 32, 978-5-903063-89-5.
Zhechev, V., Stanimirov, E. Loyalty Programs - Specifics, Types, and Benefits for Market Players. Махачкала: Изд. дом Наука плюс, 2013 с. 28 - 32, 978-5-903063-89-5.
Zhechev, V., Stanimirov, E. (2013) Loyalty Programs - Specifics, Types, and Benefits for Market Players, Махачкала: Изд. дом Наука плюс с. 28 - 32, 978-5-903063-89-5.
Zhechev, V., & Stanimirov, E. (2013). Loyalty Programs - Specifics, Types, and Benefits for Market Players. Махачкала: Изд. дом Наука плюс, с. 28 - 32.
Zhechev V, Stanimirov E. Loyalty Programs - Specifics, Types, and Benefits for Market Players. Махачкала: Изд. дом Наука плюс; 2013. p. с. 28 - 32. ISBN: 978-5-903063-89-5.
