SpringerLink (Online service), Hadjiantonis, A. M., & Stiller, B. (2012). Telecommunication Economics: Selected Results of the COST Action ISO605 Econ@Tel. Springer Berlin Heidelberg : Imprint: Springer. https://doi.org/10.1007/978-3-642-30382-1
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)SpringerLink (Online service), Antonis M. Hadjiantonis, و Burkhard Stiller. Telecommunication Economics: Selected Results of the COST Action ISO605 Econ@Tel. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 2012. https://doi.org/10.1007/978-3-642-30382-1.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)SpringerLink (Online service), et al. Telecommunication Economics: Selected Results of the COST Action ISO605 Econ@Tel. Springer Berlin Heidelberg : Imprint: Springer, 2012. https://doi.org/10.1007/978-3-642-30382-1.