Here is a sample invitation letter written by a Nigerian citizen to invite a friend from the USA
House 2, line 3
93 Compton St,
Canada. K7K 5Z4
Letter of invitation for Visa Application to visit Nigeria
This is a formal invitation for you to visit me in the Federal Capital Territory of Nigeria for three weeks from the 10th to the 30th of April 2016.
During your visit you would be staying with me and I will be responsible for your transportation while you are here.
I hope to take you to see some sights while you are here and I trust that it will be fun just as it was in Canada.
I have attached a scanned copy of my Passport!
(insert signature here)
Name: John Gray
Address: 93 Compton St, Kingston, ON K7k 5Z4
Date of Birth: 30 of June 1980
Relationship : Friend
Host Details (Enter your details)
Date of Birth
Once you have typed out the invitation make sure it is signed before you send it off.