APA-ийн эшлэл(7 дахь хэвлэлт)
Whitford, F. (2017). Scattering the seeds of knowledge: The words and works of Indiana's pioneer county extension agents. Purdue University Press.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)
Whitford, Fred. Scattering the Seeds of Knowledge: The Words and Works of Indiana's Pioneer County Extension Agents. West Lafayette, Indiana: Purdue University Press, 2017.
MLA -ийн эшлэл (9 дэх хэвлэлт)
Whitford, Fred. Scattering the Seeds of Knowledge: The Words and Works of Indiana's Pioneer County Extension Agents. Purdue University Press, 2017.
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