APA引文

Spets, S. (2013). Programming Drupal 7 entities. Packt Pub..

芝加哥风格引文

Spets, Sammy. Programming Drupal 7 Entities. Birmingham: Packt Pub., 2013.

MLA引文

Spets, Sammy. Programming Drupal 7 Entities. Packt Pub., 2013.

警告：这些引文格式不一定是100％准确.