If you are a serious pastry student, this is the textbook used in culinary schools. It includes the "51" as a foundational chapter, plus technical drawings for the macaronage process. It costs ~$60.

Egg whites are separated and "aged" in the refrigerator for at least 5 days to reduce elasticity and improve the macaron's texture. Precision Temperatures: The sugar syrup must be heated exactly to before being poured over the egg whites. Maturation: Once assembled, macarons must be refrigerated for