Final answer:
Face to face communications like interviews are considered personal communications and do not require written authorization. However, they should be cited in the text only and not included in the reference list.
Step-by-step explanation:
When conducting research or writing papers, face to face communications with an individual, such as interviews, are considered personal communications.
These types of communications do not require written authorization to be used in your research.
In academic writing, since these personal communications are not retrievable by other people, they should not be listed in the reference list. Instead, cite personal communications in the text only, providing a brief mention of the source and the date of the communication.