Look at the following writing sample. Classify it as formal, informal, or semi-formal.

I hope this translation will speak for itself, but not before I give a word of thanks to the many people who made it possible. The first among them is Jennifer Rawlins. She spent many an hour researching the project. Second, I'd like to thank Antonio Delgado. He kept me awake by making excellent cappuccinos. Finally, I'd like to give my appreciation to Joanie Stephens who edited with a fine-tooth comb.