What limitation does this source have for a historian?

O It was written before the creation of Israel.
O It is excerpted from a novel.
Sandy Tolan is a Palestinian journalist who wrote
the novel The Lemon Tree in 2007. In this
excerpt, Bashir, a Palestinian, is visiting what
used to be his family home but is currently
occupied by a Jewish family.
It has an Arab Palestinian point of view.
O It focuses on only one family.​