Sala, H. J. (1998). Heroes: People who made a difference in our world. OMF Literature.
Citace podle Chicago (17th ed.)Sala, Harold J. Heroes: People Who Made a Difference in Our World. Manila: OMF Literature, 1998.
Citace podle MLA (9th ed.)Sala, Harold J. Heroes: People Who Made a Difference in Our World. OMF Literature, 1998.
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