https://ru.wikihow.com/%D0%BF%D0%BE%D0%BB%D1%83%D1%87%D0%B8%D1%82%D1%8C-%D1%81%D0%B5%D1%80%D1%82%D0%B8%D1%84%D0%B8%D0%BA%D0%B0%D1%82,-%D1%87%D1%82%D0%BE%D0%B1%D1%8B-%D0%BF%D1%80%D0%B5%D0%BF%D0%BE%D0%B4%D0%B0%D0%B2%D0%B0%D1%82%D1%8C-%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%B8%D0%B9https://interstate-education.com/2016/10/31/sertifikaty-dlya-uchitelej-anglijskogo-yazyka/