Open learning.

(1987). Open learning. PubMed, 2(3), 24–5.

“Open learning.” PubMed, vol. 2, no. 3, 1987, pp. 24–5.

1987. “Open learning.” PubMed 2 (3): 24–5.

(1987) ‘Open learning’, PubMed, 2(3), pp. 24–5.

@article{anon1987open,
  title = {{Open learning.}},
  journal = {PubMed},
  volume = {2},
  number = {3},
  pages = {24--5},
  year = {1987}
}