The expression secret annexe was created for the English translation of her diary.
Probably. The Germans could find them at any time. They could be arrested if they were found.
The leader was Otto Frank. He was in charge of making every decision.
Above Mr.Franks office were he used to work/own
There are carefully defines methods and print styles that various authorities use for constructing a bibliography or other reference list. One journal or printer may well have their own in-house...