Denninghaus, F.
Verlag Lambert Lensing GMBH, 972
Buku Teks
Barentsen, A. A.
Moeder , 1985
Buku Teks
Lusin, Natala
Baron's Education, 1992
Buku Referensi
Smirnitsky, A.I.
Higher School Publishing House, 1975
Buku Teks
Berezyn, F.M.
Vysshaya Shkola, 1979
Buku Referensi