http://www.worldometers.info/languages/english-alphabet/ – the alphabet, capital and small letters
http://www.literacytools.ie/files/pdfs/15%20Filling%20in%20Forms.pdf – information about forms
https://admin.typeform.com/signup – about registration forms
https://www.thebalancecareers.com/job-application-form-sample-2061607 – types of job applications: forms and samples
https://www.thebalancecareers.com/types-of-job-search-letters-with-examples-2060156 – types of job search letters with examples
https://www.livecareer.com/career/advice/cover-letter/effective-cover-letter – how to write a highly effective cover letter
https://www.livecareer.com/how-to-write-a-cover-letter – how to write a cover letter
https://www.thebalancecareers.com/targeted-cover-letter-writing-tips-2060176 – cover letters tips and samples
https://www.consumer.ftc.gov/blog/2015/09/how-write-effective-complaint-letter – about letters of complaint
https://en.oxforddictionaries.com/writing-help/letters-of-complaint – types of letters of complaint