Which sentence uses the proper APA web source citation?

Roberta Murphy, a hiring manager, says it is important to make a good first impression when interviewing for a job $($Murphy$,$ pg $9).$

Roberta Murphy, a hiring manager, says it is important to make a good first impression when interviewing for a job $($Murphy$).$

Roberta Murphy, a hiring manager, says it is important to make a good first impression when interviewing for a job $($Murphy$,2012,$ pg $9).$

Roberta Murphy, a hiring manager, says it is important to make a good first impression when interviewing for a job $(2012).$