КОVALSKAYA, L. A.; 						VACHRUSHKIN, V. S..
 Morphological characters of Paphiopedilum callosum (Rchb. f.) Stein (Orchidaceae Juss.).
<strong>Modern Phytomorphology</strong>, [S.l.], v. 2, p. 39-41, apr. 2012.
ISSN 2227-9555.
Available at: &lt;<a href="http://ojs.phytomorphology.org/index.php/MP/article/view/375" target="_new">http://ojs.phytomorphology.org/index.php/MP/article/view/375</a>&gt;. Date accessed: 13 apr. 2018.
doi: <a href="https://doi.org/10.5281/zenodo.162430">https://doi.org/10.5281/zenodo.162430</a>.