La observación
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B I B L I O G R A F Í A<br />
H T T P : / / C O N C E P T O D E F I N I C I O N . D E / O B S<br />
E R VA C I O N /<br />
H T T P S : / / W W W. U G R . E S / ~ R E S C AT E / P R A<br />
C T I C U M / E L _ M _ T O D O _ D E _ O B S E R VA C I _ N<br />
. H T M<br />
H T T P S : / / B O O K S . G O O G L E . C O M . C O / B O O K S ? I<br />
S B N = 8 4 1 6 5 4 9 0 0 1
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