I am updating my notes ready for when I see a job I would like to apply for. For my second reference I am putting down my retired headteacher (she has agreed). I already have her personal email and phone number, which she gave me a while ago. However, I feel cheeky to ask for her personal home address. I understand most employers probably do not use the address and prefer to email. However, I wonder if it looks odd to leave the address section blank. Would it be acceptable on an application form to either put down the school she worked at and a short note suggesting they contact someone there for her former address, suggest they email her for her personal address or leave it blank?