More Pdf : Efecto in Spanish

Which efecto is most use?

I understand A -Clock- was most use, Then B, Now C ,

One mexican site broke these efecto in era use.




PDF Below is 13 pages.

http://www.billarjuvenil.com.ar/billar/tecnicas_sistemas/j_l_exposito/La toma de bola.pdf

PDF below is 73 pages. This one numerous illustrations.
http://www.billarjuvenil.com.ar/billar/tecnicas_sistemas/sistemas_vahedzian/sistem_vahedzian.pdf