Spets, S. (2013). Programming Drupal 7 entities. Packt Pub..
Tohutoru Kātū Chicago (17th ed.)Spets, Sammy. Programming Drupal 7 Entities. Birmingham: Packt Pub., 2013.
Tohutoro MLA (9th ed.)Spets, Sammy. Programming Drupal 7 Entities. Packt Pub., 2013.
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