Wilke, C. (2018). German Pension Reform: On Road Towards a Sustainable Multi-Pillar System. Peter Lang International Academic Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilke, Christina. German Pension Reform: On Road Towards a Sustainable Multi-Pillar System. Bern: Peter Lang International Academic Publishers, 2018.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilke, Christina. German Pension Reform: On Road Towards a Sustainable Multi-Pillar System. Peter Lang International Academic Publishers, 2018.
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