I'm writing a paper about HR and TSK's COIN strategy against the PKK for my MA. There are not much books/articles about it. Indeed, an issue is the objectivity of authors, but there is some academic research on the subject. Its not very strange that majority of the Kurdish population doesn't actively support the PKK, just like the majority of Afghans doesn't support the Taliban or the majority of the Algerians didn't support the FLN. Its not relevant. In this case both the PKK and the TSK targeted the civilian population.

Recommendations are:
Aliza Marcus, PKK Blood And Belief (war, seen from the perspective of the PKK)
Özdag, Ü., 2003. The PKK and Low Intensity Conflict in Turkey. Ankara, Frank Cass.
Pamukoglu, O., 2003. Unutulanlar Dısında Yeni Bir Sey Yok, Hakkari ve Kuzey Irak Daglarındaki Askerler. Harmony, Ankara. (Turkish general's vision)
Jongerden, J., 2007. The Settlement Issue in Turkey and the Kurds: An Analysis of Spatial Politics, Modernity and War. Brill Academic Publishers, Leiden and Boston (good analysis, also bit pro-Kurdish, but its the best on COIN).

Bruinessen has written some articles about Kurdish identity/PKK, not much about COIN
http://www.let.uu.nl/~martin.vanbrui...tml#articles#1

Turkish vision on preventing use of Children by PKK:
Preventing the PKK’s Misuse of Children by Introducing Community Policing
http://www.coedat.nato.int/publicati...i%20Dikici.pdf

Turkish Culture and its Influence on the Counter-Insurgency Campaign Against the Kurdistan Worker’s Party (PKK)

Ihaneti Gördum (book of former general ): http://www.boxca.com/a5lemmgvszuo/Er...3%BCm.pdf.html (downloadable)
http://www.inter-disciplinary.net/pt...li%20paper.pdf