Redrafting 2013 MLB Draft: Aaron Judge goes No. 1, where are the top picks now?
Appel, Despite Potential, May Fall in Baseball Draft Again - The New York Times
2013 MLB DRAFT: FIRST ROUND ANALYSIS — College Baseball, MLB Draft, Prospects - Baseball America
Mark Appel, top pick of 2013 draft, quitting baseball – thereporteronline
Mark Appel, No. 1 MLB Draft pick, agrees to terms with Astros for $6.35 million, per report
Phillies Call Up Former No. 1 Overall Pick Mark Appel
2013 Prizm Draft Picks Mark Appel Auto #1 Houston Astros
Appel hopes to make MLB debut for Astros in 2015
Astros take Mark Appel with number one pick in MLB Draft, Austin Wilson goes to Mariners - Rule Of Tree
Former No. 1 pick Mark Appel makes MLB debut nine years after being drafted, Sports
Former top pick Mark Appel has sights set on the big leagues once again
2013 No. 1 Pick Mark Appel Called Up to Majors for First Time in Career - Sports Illustrated
Appel arrives in big year for No. 1 draft picks