APA
Johansen D. A., . (2011). Plant embryology : embryogeny of the spermatophyta. Waltham Mass: The Chronica Botanica Company.
Chicago
Johansen Donald Alexander, . 2011. Plant embryology : embryogeny of the spermatophyta. Waltham Mass: The Chronica Botanica Company.
Harvard
Johansen D. A., . (2011). Plant embryology : embryogeny of the spermatophyta. Waltham Mass: The Chronica Botanica Company.
MLA
Johansen Donald Alexander, . Plant embryology : embryogeny of the spermatophyta. Waltham Mass: The Chronica Botanica Company. 2011.