HR is a vast field, and there is no single author who can be considered the guru of the entire field. However, the following books can definitely be helpful. It's important to note that these are academic journals that can truly make a difference. The list is as follows:
1. HRM, 10th ed, by Michael Armstrong
2. Remuneration and Performance Management by Michael Armstrong & Helen Murlis
3. Strategic Safari by Henry Mintzberg, 2004/05
4. HRM: Theory & Practice by John Bratton & Jeff Gold, 4th ed, 2007
5. HRM (Australian Ed) by Kramar et al.
6. Strategic Marketing Management by David Aaker, 8th ed, 2007
7. Org. Behaviour by Robbins et al, 4th ed, 2004