APA-ийн эшлэл(7 дахь хэвлэлт)

Walle, A. H. (2015). Qualitative research in business: A practical overview. Cambridge Scholars Publishing.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Walle, Alf H. Qualitative Research in Business: A Practical Overview. Newcastle upon Tyne, England: Cambridge Scholars Publishing, 2015.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Walle, Alf H. Qualitative Research in Business: A Practical Overview. Cambridge Scholars Publishing, 2015.