Koester, Sola, author
Max Hueber Verlag, 1979
Buku Referensi
Vinogradov, Viktor Vladimirovich, author
Nauka, 1977
Buku Referensi
Lusin, Natala
Baron's Education, 1992
Buku Referensi
Smirnitsky, A.I., author
Higher School Publishing House, 1975
Buku Teks
Berezyn, F.M., author
Vysshaya Shkola, 1979
Buku Referensi