GUEST,William H - You seem to have nailed the source.
Using your info in a web search brings us the publisher's web site and the author's books :-
Michael Forster

He seems to be a prolific writer of Christian stuff for schools.
Unfortunately when you click on book titles for further info, not many of them give anything particularly informative to someone who doesn't already have the book.

The song title is however listed here :-
Bumper Book of Assemblies - Book 2.

Quack!
GtD.