My son presently reading for an undergraduate degree in Electrical Engineering in USA. He is a citizen of Sri Lanka. He is offered with 5 1/2 months Industrial Training in China by a Chinese Company. This trining is a part of his degree program. He has already got an Inivitation Letter from the Chinese Company. He also got a letter from his university stating that he is a student and also he has Form I 20. Please advice whether he needs to get any other documents to apply for VISA. He will apply for Business Visa as adviced by his university as the duration of his training in China is only 5 and half months.