The Argentinian Civil Code was also in effect in Paraguay, as per a Paraguayan law of 1880, until the new Civil Code went in force in 1987.

During the second half of the 20th century, the German legal theory became increasingly influential in Argentina.

The Civil Code came into effect on January 1, 1857. Its technique is regarded as perfect; it is distinguished for the clarity, logic and cohesiveness of its provisions. As mentioned by Arminjon, Nolde, and Wolff ('Traite de droit comparé', Paris, 1950-1952) Andrés Bello may be regarded as one of the great legislators of mankind. The influence of the Napoleonic code is great; it is observed however that e.g. in many provisions of property law, the solutions of the French code civil were put aside in favor of pure Roman law.

Regarding the theory of 'sources of law' in the Guatemalan legal system, the 'Ley del Organismo Judicial' recognizes 'the law' as the main legal source (in the sense of legislative texts), although it also establishes 'jurisprudence' as a complementary source. Although jurisprudence technically refers to judicial decisions in general, in practice it tends to be confused and identified with the concept of 'legal doctrine', which is a qualified series of identical resolutions in similar cases pronounced by higher courts (the Constitutional Court acting as a 'Tribunal de Amparo', and the Supreme Court acting as a 'Tribunal de Casación') whose theses become binding for lower courts.