Strumski, G., Moskowa, E., & Anastassow, G. (1978). Nasko Warum. Sofia-Press.
Cita Chicago (17th ed.)Strumski, Georgi, Erika Moskowa, i Georgi Anastassow. Nasko Warum. Sofia-Press, 1978.
Cita MLA (8th ed.)Strumski, Georgi, et al. Nasko Warum. Sofia-Press, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.