Citations refer to the original publication, not to a Scieee localized version.
Smythies, B. E. (1972). A note on Narcissus gaditanus Boiss. & Reuter and N. minutiflorus Willk. Universidad de Sevilla. https://idus.us.es/items/1aadfc28-6b09-48f9-93ff-94dd48d95d14
Smythies, B.E. A note on Narcissus gaditanus Boiss. & Reuter and N. minutiflorus Willk. Universidad de Sevilla, 1972. https://idus.us.es/items/1aadfc28-6b09-48f9-93ff-94dd48d95d14.
Smythies, B.E. A note on Narcissus gaditanus Boiss. & Reuter and N. minutiflorus Willk. Universidad de Sevilla, 1972. https://idus.us.es/items/1aadfc28-6b09-48f9-93ff-94dd48d95d14.
Smythies, B. E. (1972) A note on Narcissus gaditanus Boiss. & Reuter and N. minutiflorus Willk. Universidad de Sevilla. Available at: https://idus.us.es/items/1aadfc28-6b09-48f9-93ff-94dd48d95d14.
B. E. Smythies, “A note on Narcissus gaditanus Boiss. & Reuter and N. minutiflorus Willk,” Universidad de Sevilla, 1972. [Online]. Available: https://idus.us.es/items/1aadfc28-6b09-48f9-93ff-94dd48d95d14
@misc{smythies1972note,
author = {Smythies, B.E.},
title = {A note on Narcissus gaditanus Boiss. \& Reuter and N. minutiflorus Willk},
year = {1972},
publisher = {Universidad de Sevilla},
url = {https://idus.us.es/items/1aadfc28-6b09-48f9-93ff-94dd48d95d14}
}
The source metadata has no journal, volume or pages. Add them from the original publication if your citation needs them.