Lief, A. (1958). "It floats": The story of Procter & Gamble. New York: Rinehart & Company, Inc.
Чикагска система за цитиранеLief, Alfred. "It Floats": The Story of Procter & Gamble. New York: Rinehart & Company, Inc, 1958.
MLA формат за цитиранеLief, Alfred. "It Floats": The Story of Procter & Gamble. New York: Rinehart & Company, Inc, 1958.
Внимание: Тези цитати може да не са 100% точни.