If you are looking to do further reading on Anti-Revisionism, Communism, or Dialectical Materialism, the following are the texts considered seminal in studying Marxism-Leninism. 

Karl Marx & Frederick Engels

The Communist Manifesto

The Principles of Communism

Socialism: Utopian and Scientific

The Origin of the Family, Private Property and the State

On Authority

Critique of the Gotha Programme

Anti-Duhring

Capital

Value, Price and Profit

Wage, Labor and Capital

V. I. Lenin

The State and Revolution

How Kautsky Turned Marx into a Common Liberal

What Is To Be Done?

The Rights of Nations to Self-Determination

Imperialism, The Highest Stage of Capitalism

''Left-Wing'' Communism, An Infantile Disorder

On the Question of Dialectics

Democracy and Dictatorship

Marx's Economic Doctrine

Draft Thesis on National and Colonial Questions

On StrikesTactics of the Class Struggle of the Proletariat

Marxism and Revisionism

Economics and Politics in the Era of the Dictatorship of the Proletariat

Marxism and ReformismThe State

Where to Begin

J.V. Stalin

The Foundations of Leninism

Marxism Versus Liberalism

Marxism and the National Question

Anarchism or Socialism?

Dialectical and Historical Materialism

Economic Problems of Socialism

Trotskyism or Leninism?

The Fight Against Right and 'Ultra-Left' Deviations

Enver Hoxha

Imperialism and the Revolution

Eurocommunism is Anti-Communism

Reject the Revisionist Thesis of the 20th Congress

The Marxist-Leninist Movement and the World Crisis of Capitalism

Theory and Practice of the Revolution

The Khrushchevites

The Titoites

The Modern Revisionists

Yugoslav "Self-Administration" - Capitalist Theory and Practice

Online Resources:

The Real Stalin Series — An exhaustive overview of the various anti-communist myths, attacks, and slanders against Stalin, prepared by the late Dennis "Klo" McKinsey. 

ML Today — A new (2019) blog dedicated to advancing Marxist-Leninist theory and preserving the theoretical work done by significant anti-revisionist thinkers. 

The Espresso Stalinist Online Library — A collection of freely downloadable mostly book-length PDFs on a wide variety of issues relating to world Communism. 

Soviet Revisionism — An in depth analysis of Soviet revisionism and social-imperialism. 

Chinese Revisionism — An outline of the case against Dengism and Socialism with Chinese Characteristics. 

Marxist-Leninist Translations — A large collection of translated works from international Marxist-Leninist parties. 

Farm To Factory, Robert C. Allen — An exhaustive statistical analysis of the realities of Soviet industrialization, which dispels many common claims about collectivization.