recommendation letter

There are three recommendation letters. 1) one is from my research advisor when I pursue Master degree in BUT; One page is ok. 2) one is from the department manager when I worked in Siemens. One page is ok. 3) the final one is from the department manager when I worked in Samsung. If one page is not enough since there are many content, 2 page is also ok. Each letter shall be writer in different format, since I will send them to the same university.