Rough Guide to Morocco or Footprint Morocco — Either of these covers the south of Morocco in practical detail, including Tiznit, the Anti-Atlas, and the road towards the Sahara. Useful for planning onward routes and understanding regional context.
Hideous Kinky by Esther Freud — A memoir of a childhood spent travelling through Morocco in the early 1970s, centred on Marrakech but evoking the texture of the country. More atmosphere than guidebook, but gives a strong sense of place.
The Jewellery of North Africa by Henriette Taillard or any survey of Amazigh (Berber) jewellery and crafts — Useful background for understanding the silver work that Tiznit is known for: the symbolic forms, regional variations, and techniques that distinguish Berber jewellery from Arab or Moorish styles.
Their Heads are Green and Their Hands are Blue by Paul Bowles — Essays on Morocco and North Africa written by the American novelist who lived in Tangier for decades. Thoughtful and sometimes dark observations on Moroccan culture and travel that hold up well.