Bibliography (15):

1. https://sarabander.github.io/sicp/html/1_002e3.xhtml

2. Iterate

3. TakeWhile

4. Product

5. Haskell Monoids and Their Uses

6. https://learnyouahaskell.com/functors-applicative-functors-and-monoids#monoids

7. https://book.realworldhaskell.org/read/data-structures.html#id637702

8. https://hoogle.haskell.org/?hoogle=Sum

9. Product

10. Data.Monoid

11. https://hoogle.haskell.org/?hoogle=Num

12. (Monoid_a)_=>_a_->_a_->_a

13. (Monoid_a)_=>_a

14. Wikipedia Bibliography:

    1. Function composition  :

       https://en.wikipedia.org/wiki/Function_composition

    2. Monoid