Kevin O’Keefe has some ideas about quoting and linking to others’ work:
Far too many people today blog based on their own knowledge as an expert on a subject without referencing anyone. It’s a breath of fresh air, as an authority and long time blogger in a niche, for someone to cite what I said and why. I remember those people as they stick out like shining stars.
Couple ways to let the authority know that you referenced them. Share your post on Twitter and give them a hat tip, h/t @kevinokeefe. Alternatively, drop them an email saying “as a courtesy, I wanted to let you know that I referenced what you wrote/said in a recent blog post of mine etc, keep up the good work.”