Final answer:
Corrie ten Boom developed her own sources of information by establishing connections with resistance groups, an approach that mirrors various forms of resistance seen throughout Europe during World War II.
Step-by-step explanation:
In "The Hiding Place", Corrie ten Boom is advised by her brother Willem to "develop your own sources" of information. The way she does this is by establishing connections with resistance groups. Resistance movements played a crucial role during World War II, where individuals and groups engaged in efforts to undermine the Nazi regime. These included acts of armed resistance, cultural and spiritual preservation, and managing to save lives, such as Irena Sendler smuggling out Jewish children or Oskar Schindler protecting his Jewish workers. Corrie's establishing of connections with the Dutch underground resistance helped them in their efforts to hide and protect Jews from the Nazi persecution, resembling the resistance efforts that took place across Europe, which included not only fighting but also maintaining humanity and dignity through cultural and spiritual acts.