Morrell Margot. (2002). Shackleton's Why: Leadership Lesson.. Great Antarctic explorer. Penguin books.
Chicago-čujuhus (17. p.)Morrell Margot. Shackleton's Why: Leadership Lesson.. Great Antarctic Explorer. USA: Penguin books, 2002.
MLA-čujuhus (9. p.)Morrell Margot. Shackleton's Why: Leadership Lesson.. Great Antarctic Explorer. Penguin books, 2002.
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