APA (7e ed.) Bronvermelding

Sala, H. J. (1998). Heroes: People who made a difference in our world. OMF Literature.

Chicago (17e ed.) Bronvermelding

Sala, Harold J. Heroes: People Who Made a Difference in Our World. Manila: OMF Literature, 1998.

MLA (9e ed.) Bronvermelding

Sala, Harold J. Heroes: People Who Made a Difference in Our World. OMF Literature, 1998.