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There's a book that I haven't seen mentioned before that may be useful for Beaton researchers with a Canadian connection. It is A Dictionary of Scottish Emigrants to Canada Before Confederation. It was written by Donald Whyte F.H.G., F.S.G. and was published by the Ontario Genealogical Society in 1986. There's a second volume as well. This book is widely available in libraries. I found it in a library in my county. WorldCat lists over 100 libraries worldwide with the book in their collections. Your local public librarian should know about WorldCat. You can find out if it is held by any nearby libraries or, if not, your local librarian can use WorldCat to inter-library loan it.
Mabou Pioneers is one of the main sources for the book, but it does have additional information even if Mabou Pioneers is listed as the principal source for a particular entry. Each entry has a source listed. There are errors, of course, but it looks like a valuable addition to one's sources.
Whyte shares a surname (and spelling) with the 18th century clergyman whose book on the Beatons of Skye is the source of the story that a Dr. Peter Beaton, first cousin of Cardinal David Beaton, and of the Mary Beaton in the song "The Four Marys," was the progenitor of the Beatons of Skye. It isn't so and caused me much confusion when I started looking at the Beatons. The story is found in Mabou Pioneers, among other sources, but all derive from Whyte. I wonder if the 18th century clergyman Whyte and Donald Whyte are related.