John, Thank You for exhaustive informations.
The source is "J. Scutts - Bf 109 Aces of North Africa and the Mediterranean", p. 90, Osprey Aircraft of the Aces No. 2.
This information is duplicated at
http://en.wikipedia.org/wiki/Hans_Joachim_Marseille
however date of Marseille's 50th victory is obviously mistaken.
Thanks also for recommendation of Your book, I'll buy it at the first occasion.
Best regards,
Nef
PS.
My dream is to have an access to his flight book...