Try these ones!

Best wishes,

Tatiana

http://bookzz.org/book/659057/f5c6c0

http://www.google.ru/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CBwQFjAA&url=http%3A%2F%2Fkeys.lucidcentral.org%2Fkeys%2Fv3%2Fdiatoms%2Fkey%2Findex%2FMedia%2FHtml%2Fabout.htm&ei=JdjbVPq3EuPQygOXzIGICw&usg=AFQjCNEzxrZ-QemQnbfnXUdu8FjKfAvw-A&sig2=7w6-kO3wVR02NFvbxJbQWQ&bvm=bv.85761416,d.bGQ

http://www.google.ru/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0CD0QFjAH&url=http%3A%2F%2Fwww.wrc.org.za%2FKnowledge%2520Hub%2520Documents%2FResearch%2520Reports%2FTT282-07.pdf&ei=JdjbVPq3EuPQygOXzIGICw&usg=AFQjCNGTvGmRlNacdiWo2_-7GNLhPSFAfg&sig2=y2yxVFDcyNWpjigP6Hx-AQ&bvm=bv.85761416,d.bGQ

http://www.google.ru/url?sa=t&rct=j&q=&esrc=s&source=web&cd=10&cad=rja&uact=8&ved=0CE0QFjAJ&url=http%3A%2F%2Fcraticula.ncl.ac.uk%2FEADiatomKey%2Fhtml%2Fmanual.pdf&ei=JdjbVPq3EuPQygOXzIGICw&usg=AFQjCNHZAZaaErh2SdG6rQstplAEAuUg-A&sig2=vswrwN3eQwHzFSuf1dgEAw&bvm=bv.85761416,d.bGQ

https://www.researchgate.net/post/Could_anyone_list_the_most_useful_and_practical_freshwater_diatom_taxonomic_guides_books

Dear Tatiana,

for identification of freshwater diatoms best references is follow book:

Süßwasserflora von Mitteleuropa, Bd. 02/5: Bacillariophyceae: Teil 1-5: English and French translation of the keys (German and French Edition).

Regards

thank you tatiana. thanx moslem, it is useful links.