The author who created The 5 Languages of Love is Gary Chapman and can be found here http://www.5lovelanguages.com/learn-the-languages/the-five-love-languages/ from what I have read, he is extremely knowledgeable, here is an example:
"Of the countless ways we can show love to one another, five key categories, of five love languages, proved to be universal and comprehensive - everyone has a love language, and we all identify primarily with one of the five love languages: Words of Affirmation, Quality Time, Receiving Gifts, Acts of Service and Physical Touch."
There are many things to be learned from this article and the assessment, you will be surprised what you will learn about yourself; and not in a bad way.
Have a GREAT day!
Love and Light!