diff --git a/citations.txt b/citations.txt
index f9766dc..c8bd8fa 100644
--- a/citations.txt
+++ b/citations.txt
@@ -48,6 +48,8 @@ DeepFace is cited by the following papers.
 
 [18] Hazirbas, Caner, et al. "Casual Conversations: A Dataset for Measuring Fairness in AI." Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition. 2021.
 
+[19] Grimmer, Marcel, Raghavendra Ramachandra, and Christoph Busch. "Deep Face Age Progression: A Survey." IEEE Access (2021).
+
 Based on the following academic repositories
 
 [1] Google Scholar: https://scholar.google.com/scholar?oi=bibs&hl=tr&cites=17652496388087594988