ISTJ
ISTJ (inspector, examiner)
Quiet, serious, earn success by thoroughness and dependability. Practical, matter-of-fact, realistic, and responsible. Decide logically what should be done and work toward it steadily, regardless of distractions. Take pleasure in making everything orderly and organized – their work, their home, their life. Value traditions and loyalty.
ISTJ (Facebook page) 
Portrait of an ISTJ - Introverted Sensing Thinking Judging
ISTJ (Wikipedia)
Introverted Sensing Thinking Judging (typelogic.com)
Keirsey Temperament Website - Portrait of the Guardian® Inspector (ISTJ)
Famous ISTJs
About the ISTJ (mypersonality.info)
ISTJ Personality Types (teamtechnology.co.uk)
ISTJ (similarminds.com)
ISTJ (about.com)
In italiano
ISTJ – Gli ispettori, gli esecutori (lastessamedaglia.com)
Panoramica delle sedici personalità (ciaciolandia)
Tipo ISTJ (bancacv.it)
Gli Ispettori Introverted Sensing Thinking Judging
L'Ispettore Introversion Sense Thinking Judging (paesebalocchi.blogspot.it)