APA-ийн эшлэл(7 дахь хэвлэлт)

Nayyar, G. (2009). The Demand for Services in India. A Mirror Image of Engel's Law for Food? Department of Economics (University of Oxford).

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Nayyar, G. The Demand for Services in India. A Mirror Image of Engel's Law for Food? Department of Economics (University of Oxford), 2009.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Nayyar, G. The Demand for Services in India. A Mirror Image of Engel's Law for Food? Department of Economics (University of Oxford), 2009.