While I appreciate your desire to understand human psychology to handle your job pressures better, I am not really sure of your reasons for focusing on Sigmund Freud. Sigmund Freud essentially focuses on the concepts and principles of human psychology—not really the ideal choice for practicing HR professionals, who would benefit more from tips and topics on Applied Psychology.
Suggestions for Finding Psychology Books
Coming to your core query, I suggest browsing the internet—I am sure you will find many books with reviews that will help you decide which book you wish to go for.
All the best.
Regards,
TS