Reference is essential when we need to use in our publication a reflection that was not the product of our mind. In other words: in order to avoid plagiarism, references have been introduced and they still remain popular, not only in academic field but also in everyday life. Due to the carefully prepared list of authors whose reflections have been used in a particular publication, it is much less problematic to find more information concerning the issue that interests the reader. All that needs to be done is to follow the references.