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It seems that MacMillan Computer Publishing USA acquired Prentice Hall Computer Publishing at some point. If I ever find a secondary source for that, I'll add it to the article.
Since the page was moved recently, I'll also note that at least as of 1993, the full name was "Hayden Books", not "Hayden Book Co." or "Hayden Book Company".
References
^Rubin, Scott; Cohen, Raines (1993). Hayden's PowerBook Power Book (2nd ed.). Indianapolis, IN: Hayden Books. ISBN1-56830-057-3.
