Dinheiro Luso-Indiano – Indo-Portuguese Money, by J. Ferraro Vaz and M. Correia de Sousa, is a major reference work on the monetary history of the Portuguese State of India. Published in Braga in 1980, the book presents a comprehensive study of the coins and banknotes used in Portuguese India from the arrival of the Portuguese in 1498 to the twentieth century.

The volume combines historical research with a cataloguing approach, presenting the different coin and paper-money issues in chronological order and illustrating them with numerous detailed drawings and plates. With more than six hundred pages and extensive visual documentation, the book is considered one of the most complete studies on Indo-Portuguese numismatics.

It remains an important reference for collectors and scholars interested in the monetary systems of the Portuguese overseas empire in Asia.

The Great History of the Portuguese Escudo, by António Miguel Trigueiro, is a work dedicated to the historical and numismatic study of the Portuguese currency during the period when the escudo served as the national monetary unit.

Published in 2003 by Coleções Philae, the book explores the evolution of Portuguese coinage from the establishment of the Republic in 1910, when the escudo replaced the real, until its replacement by the euro at the beginning of the twenty-first century.

The author examines the various coin issues in escudos, including circulation coinage and commemorative emissions, placing them within their historical, political, and economic context.

This work represents a valuable contribution to the study of modern Portuguese numismatics and the monetary history of Portugal in the twentieth century.

The Duke of Galliera Collection is one of the most renowned private collections of Portuguese coins in the 20th century. Compiled by the Duke of Galliera (1839‑1905), the collection stands out for the quality, diversity, and historical range of its coins, from medieval to modern issues.

The catalogue Portuguese Coins from the Collection of the Duke of Galliera, published in Lisbon in 1949 by J. Almeida, M. Basto, and L. Piombino, documents and illustrates this significant collection. Coins are arranged according to typological and historical criteria, reflecting the richness of Portuguese numismatics over the centuries.

The book preserves the Duke of Galliera’s legacy and remains a key reference for collectors, researchers, and numismatics scholars, allowing detailed study of one of the most important private collections of Portuguese coins.

Numismática de Angola (Subsídios) by Cecílio Moreira is a work dedicated to the study of Angolan coinage during the Portuguese colonial period.

Published in Luanda in 1963 by the Centro de Informação e Turismo de Angola and printed by the Imprensa Nacional de Angola, this book compiles important data and contributions to the understanding of monetary circulation in the territory.

The work presents a descriptive and historical overview of the coins used in Angola, making it a valuable reference for collectors and researchers interested in Portuguese colonial numismatics.