Villers is correct. The name "Luger" is not the usual term in Gemany. People just refer to the "08" (standard) "ARI 08" (long-barrelled artillery) and "04" pistols. If buying anything, be very careful to specify exactly what you are getting. There are books on the Luger, but for a beginner, like myself, a good start is the very interesting VISIER Special No. 48 "Pistole 08". Worth getting IMHO.
Patrick