Umm.. Any site ending in .Gov or .Edu
Encyclopedia
Books written in depth on the subject
Any written or spoken words from creditable people who study\mastered the subject
Hope this helps.
Answer:
ok
Explanation:
hey bro ,am writing this letter to inform you about my father's birthday party so will you be able to come cause his turning 60 which means all of his children should be there to celebrate with him and let him know that indeed we love him as his children and all we want for him is to be happy ❤️