Step-by-step explanation:
Ethics is a very important part in our daily lives. Ethics plays a vital role in a public speaking situation. An ethical public speaker should always be honest and should avoid plagiarism by taking his notes during the research process, identifying the sources, and ten deciding when it is suitable to cite the sources.
The ethical public speakers also also cite the sources properly by understanding how to paraphrase and then directly quote the sources.
In the context, if I lost the citation information for an important source for my speech, I will paraphrase the information and avoid plagiarism and as an ethical speaker I will mention that the abstract has been taken from an external source but the citation information was lost.