Which of the following is cited correctly in APA style?

H$.$ M$.$ Smeagol and P$.$ J$.$ Smeagol $(1999)$ define pointers as "variables that contain as their values addresses of other variables" $($p$.294).$

H$.$ M$.$ Smeagol and P$.$ J$.$ Smeagol $($C How to Program$)$ define pointers as "variables that contain as their values addresses of other variables" $($p$.294).$

H$.$ M$.$ Smeagol and P$.$ J$.$ Smeagol define pointers as "variables that contain as their values addresses of other variables" $(1999,$ p$.294).$