To create our web page we looked at the next books and web pages:

-Fibonacci spiral:

wikipedia (13th of March). Fibonacci number. Retrieved March 14, 2007,

-Fibonacci number and nature:

Knott, Ron (5th of March). Fibonacci Numbers and Nature . Retrieved March 15, 2007

-Golden ratio:

Freitag, Mark (1975). That golden number. Retrieved March 15, 2007,