Select the correct text in the passage. Which two sources that Jenna used to write her research paper are secondary sources?

Jenna is writing a research paper about the Battle of Gettysburg for her US history class. Her teacher stressed that her research must include both primary and secondary sources. Jenna consulted an encyclopedia to learn about the Battle of Gettysburg. Then she studied a book of photographs that showed what the battlefield looked like right after the battle. Next, she reada chapter about the battle in a book called Great Battles of the Civil War. She then reviewed several entries in a Union Soldier’s diary. Later, she read a letter written by General Robert E. Lee right after the battle that described what happened. After taking careful notes from all her sources, Jenna felt she was ready to begin writing her research paper.