General information:
Die Kontaktstelle für EU-Praktika rät aufgrund der problematischen Lage im Land von einem Auslandsaufenthalt in der Türkei dringend ab. Bitte beachten Sie die Reise-und Sicherheitshinweise des Auswärtigen Amts: https://www.auswaertiges-amt.de/DE/Laenderinformationen/00-SiHi/TuerkeiSicherheit.html

Visa: 
Visa types and requirements: http://www.mfa.gov.tr/general-information-about-turkish-visas.en.mfa

Entry and residence requirements:
Ministry of Foreign Affairs: mfa.gov.tr/...
Inter Nations: internations.org/...

Working in Turkey:
EURES-Portal: https://ec.europa.eu/eures/public/de/homepage
Work permit: invest.gov.tr/...
Employees and Social security: invest.gov.tr/...

Social insurance provisions:
Ministry of Labour and Social Security: csgb.gov.tr/...

Insurance:
Travel insurance: turkish-embassy.net/...
Globalsurance: globalsurance.com/...

Health Care in Turkey:
Wikipedia: en.wikipedia.org/...
European health insurance card: Not valid in Turkey

Tax regulations:
Revenue Administration, Department of Taxpayer Services: gib.gov.tr/...

Accommodation:
Erasmusu: erasmusu.com/...

Country information:
Turkish Odyssey: turkishodyssey.com/
Turkish Culture Portal: turkishculture.org/
Stereotyping description: zompist.com/...

Further information:
Go Turkey Tourism : http://www.goturkeytourism.com/
Home Turkey: http://www.hometurkey.com/
Business in Turkey Guide: http://www.pwc.com.tr/
Starting a Business: doingbusiness.org