To begin studying Classical Mechanics at an honors third-year BS level in Physics, it's essential to consider your mathematical background and specific interests. Recommendations vary widely based on these factors. Notable textbooks include Shankar, Spivak, Kibble & Berkshire, Morin, Taylor, K&K, Spiegel, and L&L, each catering to different levels of understanding. Exploring Amazon previews of these books can help determine which aligns best with your needs and course requirements.