APA (7 वां संस्करण) प्रशस्ति पत्र
Helland, I. S. (2010). Steps towards a unified basis for scientific models and methods. World Scientific.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Helland, Inge S. Steps Towards a Unified Basis for Scientific Models and Methods. Singapore ; Hackensack, N.J.: World Scientific, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Helland, Inge S. Steps Towards a Unified Basis for Scientific Models and Methods. World Scientific, 2010.
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