What is a good source on the Holy Spirit in John's Gospel
The Dictionary of Jesus and the Gospels, 1st ed. | Logos Bible Software has a good article on the Holy Spirit in John. The second edition is also available in Logos, but I cannot attest to any differences between the two versions.
I agree with the recommendation to look at the IVP Dictionary. This search was also helpful: "Holy Spirit in" WITHIN 5 WORDS (John OR John's)I did WITHIN 5 WORDS to catch constructions like "the Gospel according to John" and "John's Gospel".
