Ryan, J. A. (1921). The Labor Problem, What It Is- How to Solve It. A Catechism on the Social Question. New York.
Lua i Stíl Chicago (17ú heag.)Ryan, John A. The Labor Problem, What It Is- How to Solve It. A Catechism on the Social Question. New York, 1921.
Lua MLA (8ú heag.)Ryan, John A. The Labor Problem, What It Is- How to Solve It. A Catechism on the Social Question. New York, 1921.
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