Meyer, B. “Opiate Receptors and Opioid Peptides: "The Poppies of the Mind"”. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt; 1, no. 4 (March 25, 1982): 195-198. Accessed December 22, 2024. http://satnt.co.za/index.php/satnt/article/view/15.