Can We Trust "To Be A Slave"?

I think we can trust Julius Lester because he does include interviews and letter of former slaves who lived through this. Another reason is that he shows cases of owners being bad such as in page 49 were the slave says "They zamine you just like they do a horse" showing how they were treated like animals instead of humans but he also hows cases of owners not treating them as bad like in page 31 and 32 were Byrl Anderson explains how here master was actually a good man who was against slavery "He called up a old sow of 13 pigs all different colors, you see those pigs are all differnt colors but they all have the same mother, they are all brothers and sisters." Julius Lester hows differnt stories from many slaves all having a different view of slavery showing how it was bad to some and good to others and thats why I think we can trust him.