beginner texts

primary literature:

• the communist manifesto - karl marx & friedrich engels
  
• socialism: utopian and scientific - friedrich engels
  
• value, price, and profit - karl marx
  

secondary literature: 

• the revolutionary ideas of karl marx - alex callinicos
  
• why marx was right - terry eagleton 
  
• formation of the economic thought of karl marx - ernest mandel
• an introduction to marxist economic theory - ernest mandel
• unravelling capitalism - joseph choonara 

intermediate texts

primary literature:

• a contribution to the critique of political economy - karl marx
  
• the german ideology - karl marx & friedrich engels
  
• the origin of the family, private property, and the state - friedrich engels
  
• the condition of the working class in england - friedrich engels
  

secondary literature:

• state and revolution - vladimir lenin
• reform or revolution - rosa luxemburg 
• marx’s ecology - john bellamy foster
• moneybags must be so lucky - robert paul wolff
  
• marx’s concept of man - eric fromm
• the theory of capitalist development - paul sweezy
• monopoly capital - paul sweezy & paul baran
• marx on money - suzanne de brunhoff 
• marxist economic theory vol 1 - ernest mandel
• marxist economic theory vol 2 - ernest mandel
  
• contending economic theories - richard wolff & stephen resnick
• seventeen contradictions and the end of capitalism - david harvey
• an introduction to the three volumes of karl marx’s capital - michael heinrich

advanced texts

primary literature:

• capital vol 1 - karl marx
  
• capital vol 2 - karl marx
• capital vol 3 - karl marx
• theories of surplus value - karl marx
  
• grundrisse - karl marx
  

secondary literature:

• the production of commodities by means of commodities - piero sraffa
  
• capitalism: competition, conflict, crises - anwar shaikh
• reclaiming marx’s capital - andrew kliman
• marx’s theory of price and its modern rivals - howard nicholas
• essays on marx’s theory of value - isaak rubin
• money and totality - fred moseley
• late capitalism - ernest mandel
• marx’s economics - michio morishima 
• marx beyond marx - antonio negri

tl; dr: GET THOSE WINGS FLAPPING PEOPLE.