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This Constitution may be called the Constitution of India [Art 393: Name of the Constitution]
This article and articles 5, 6, 7, 8, 9, 60, 324, 366, 367, 379, 380, 388, 391, 392 and 393 shall come into force at once, and the remaining provisions of this Constitution shall come into force on the twenty-sixth day of January 1950, which day is referred to in this Constitution as the commencement of this Constitution [Art 394 Commencement of the Constitution ]
The Indian Independence Act, 1947 and the Government of India Act, 1935, together with all enactments amending or supplementing the latter[Article 395: Repeals]
READ: PAKISTAN OR THE PARTITION OF INDIA BY Dr. B. R. Ambedkar 1940
Draft Constitution of India-1948
Constituent Assembly Debates
White Paper on Indian States-1948-Ministry of States GOI
The Constitution of India: Original Unamended Version 1949
National Constitutions [198 Countries]
Essentials of the new Constitution of India-1948
Government of India – Macaulay
READ: FULL TEXT OF THE INDIAN CONSTITUTION 
Advocatetanmoy Law Library 