Secondary Sources ~ W. D. J. McKay

An ecclesiastical republic: church government in the writings of George Gillespie by W. D. J. McKay (Studies of Westminster Divines)
George Gillespie and the Westminster Assembly: the defence of Presbyterianism by W. D. J. McKay (Studies of Westminster Divines)
Scottland and the Westminster Assembly by W.D.J. McKay (WA)
The nature of church government in the writings of George Gillespie (1613-1648) by W. D. J. McKay (DCG)