In "Doctrinal Discussion" William Sillings writes:

What is the “Word of God”? The Word of God is the direct self-revelation of God to humanity. This part of revelation is often listed by theologians in the area of “special revelation” and includes both words and deeds of God's direct self-revelation.

Sillings continues on page 74 about how God's Word takes three forms.
Source: Studies in the Psalms: Adult Teacher's Insights, page 74.