Ostendorf, F. W. (1933). De groei van jonge hevea-oculaties: With summary: the growth of young hevea buddings. H. Veenman & Zonen.
Lua i Stíl Chicago (17ú heag.)Ostendorf, F. W. De Groei Van Jonge Hevea-oculaties: With Summary: The Growth of Young Hevea Buddings. Wageningen: H. Veenman & Zonen, 1933.
Lua MLA (8ú heag.)Ostendorf, F. W. De Groei Van Jonge Hevea-oculaties: With Summary: The Growth of Young Hevea Buddings. H. Veenman & Zonen, 1933.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.