A. Ngan & R. Conduit (2011). "A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality". Phytotherapy Research. 25 (8): 1153–1159. doi:10.1002/ptr.3400. PMID21294203.
A. Ngan & R. Conduit (2011). "A double-blind, placebo-controlled investigation of the effects of Passiflora incarnata (passionflower) herbal tea on subjective sleep quality". Phytotherapy Research. 25 (8): 1153–1159. doi:10.1002/ptr.3400. PMID21294203.