Please provide a bibliography of three sources from the Nelson Mandela Foundation.

1. Mandela, Nelson. "Long Walk to Freedom: The Autobiography of Nelson Mandela." Nelson Mandela Foundation, 1994.

2. "Nelson Mandela Foundation Annual Report." Nelson Mandela Foundation, 2020.

3. "Nelson Mandela Foundation: Our Work." Nelson Mandela Foundation, https://www.nelsonmandela.org/our-work.

1. Mandela, N. (n.d.). Conversations with Myself. Nelson Mandela Foundation. https://www.nelsonmandela.org/news/entry/conversations-with-myself-by-nelson-mandela

2. Mandela, N. (n.d.). Long Walk to Freedom. Nelson Mandela Foundation. https://www.nelsonmandela.org/news/entry/long-walk-to-freedom

3. Nelson Mandela Foundation. (n.d.). The Nelson Mandela Annual Lecture. Nelson Mandela Foundation. https://www.nelsonmandela.org/news/entry/the-nelson-mandela-annual-lecture