Gaya APA

Krass, P. (2007). Ignorance, confidence, and filthy rich friends: the business adventures of Mark Twain, chronic speculator and entrepreneur (1). New Jersey: John Wiley & Sons.

Gaya MLA

Krass, Peter. "Ignorance, confidence, and filthy rich friends: the business adventures of Mark Twain, chronic speculator and entrepreneur". 1 New Jersey: John Wiley & Sons, 2007. Text.