Kriegel Robert. (1991). If it Ain't Broke-- Break it!: And other unconventional wisdom for a changing business world. Warner Books a time warner company.
Παραπομπή σε μορφή Chicago (17η εκδ.)Kriegel Robert. If It Ain't Broke-- Break It!: And Other Unconventional Wisdom for a Changing Business World. USA: Warner Books a time warner company, 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)Kriegel Robert. If It Ain't Broke-- Break It!: And Other Unconventional Wisdom for a Changing Business World. Warner Books a time warner company, 1991.
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