G'morning Gerrit, 

 MM> Not being familiar with the German language, I have no idea how
 MM> this might be termed in German - but there's my definition of a
 MM> textbook for your translation...

 GK> As I mentioned here earlier there is the German term
 GK> "Lehrbuch", which may come close to that. However, I cannot
 GK> remember a German word for an "advanced" book. Is there an
 GK> English term for that?

An `advanced' book might well be called a `standard reference' to 
differentiate it from ordinary textbooks ...

"Sampling Techniques", 3rd edition, by WG Cochran springs to mind 
in statistical maths as an example of the textbook always cited in 
all other respectable texts on estimating any kind of population's 
statistics....

:-))
  
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