WICK'S, W. (1998). OPTICAL TRICKS. SCHOLASTIC INS.
Cita Chicago (17th ed.)WICK'S, WALTER. OPTICAL TRICKS. SCHOLASTIC INS, 1998.
Cita MLA (9th ed.)WICK'S, WALTER. OPTICAL TRICKS. SCHOLASTIC INS, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.