translate English to German: Furthermore, our own inquiries (so-called secondary information sources) are also being used by contacting suppliers, self-assessments, news from daily- and business press, information from our own internal debt collection etc.
Hinzu kommen eigene Recherchen wie z.B. Lieferantenrückfragen, Selbstauskünfte, örtliche Tages- und Wirtschaftspresse, Platzrecherchen, internes Inkassowesen, etc (sog. "Sekundäre Informationsquellen").