Ranjit, Ranjit, Pawan Kumar, Pawan Kumar, and Gurdial Singh. 2015. “Histology, Histochemistry and Scanning Electron Microscopy of Nasopharyngeal Tonsil of the Young Pigs”. Indian Journal of Veterinary Anatomy 27 (1). https://epubs.icar.org.in/index.php/IJVA/article/view/49608.