APA-čujuhus (7. p.)
Letiche, H., & Lightfoot, G. (2014). The relevant PhD. Sense Publishers.
Chicago-čujuhus (17. p.)
Letiche, Hugo, juo Geoffrey Lightfoot. The Relevant PhD. Rotterdam, Netherlands: Sense Publishers, 2014.
MLA-čujuhus (9. p.)
Letiche, Hugo, juo Geoffrey Lightfoot. The Relevant PhD. Sense Publishers, 2014.
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