1. Bakuzis EV, Hansen HL (1965) Balsam Fir: a Monographic Review, University of Minnesota, St. Paul, MN. p. 322.
2. Becker N, Petric D, Zgomba M, Boase C, Madon NM, Dahl C, Kaiser A (2010) Mosquitoes and their Control, 2nded. Springer, Heidelberg. pp. 76–81.
3. Basic techniques involved in helminth preservation
4. Bruce-Gregorios JH (2006) Histopathologic Techniques, 2nded. Goodwill Trading Co, Quezon City, Philippines. p. 71.